We've added a "Necessary cookies only" option to the cookie consent popup. The best answers are voted up and rise to the top, Not the answer you're looking for? \[\ce{HCO3-}(aq)+\ce{H2O}(l)\ce{H3O+}(aq)+\ce{CO3^2-}(aq)\], \[ K_{\ce{HCO3-}}=\ce{\dfrac{[H3O+][CO3^2- ]}{[HCO3- ]}}=4.710^{11}\]. Many people like to put lemon juice or vinegar, both of which are acids, on cooked fish (Figure \(\PageIndex{1}\)). An acid and base react to form a salt. The reaction, \[CaCO_3(s)+2HCl(aq)CaCl_2(aq)+H_2O(l)+CO_2(g)\]. The base dissociation constant value for Ca(OH). We can rank the strengths of bases by their tendency to form hydroxide ions in aqueous solution. This is the most complex of the four types of reactions. To identify the conjugate acid, look for the pair of compounds that are related. Thanks for contributing an answer to Chemistry Stack Exchange! Example: Sodium hydroxide(NaOH), Barium hydroxide (Ba(OH). The base dissociation constant, K b, is a measure of basicitythe base's general strength. This reduces the odor of the fish, and also adds a sour taste that we seem to enjoy. We aim to make complex subjects, like chemistry, approachable and enjoyable for everyone. To the best of my knowledge, a conjugate acid of a base is the base after it has accepted a proton, or a $\ce{H+}$ ion. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? If A is a weaker base, water binds the protons more strongly, and the solution contains primarily A and H3O+the acid is stronger. arrow . When placed in water, virtually every HCl molecule splits into a H+ ion and a Cl- ion in the reaction.1, \[\ce{HCl(aq) + H2O(l) <=> H3O^{+}(aq) + Cl^{-}(aq)} \nonumber\], For a strong acid like HCl, if you place 1 mole of HCl in a liter of water, you will get roughly 1 mole of H30+ ions and 1 mole of Cl- ions. The percent dissociation of an acid or base is mathematically indicated by the acid ionization constant (Ka) or the base ionization constant (Kb)1. Properties of Calcium hydroxide The brine solution favors the growth of beneficial bacteria and suppresses the growth of harmful bacteria. Weak acids exist mostly as molecules with only a few ions in solution, therefore the bonds holding H and A together must be strong. E. Write the balanced equation for the reaction occurring when a solution of calcium chloride . For example, sulfuric acid, a strong acid, ionizes as follows: \[ \ce{H2SO4}(aq)+\ce{H2O}(l)\ce{H3O+}(aq)+\ce{HSO4-}(aq)\]. Example \(\PageIndex{1}\): Calculation of Percent Ionization from pH. The chemical equation for the dissociation of the nitrous acid is: \[\ce{HNO2}(aq)+\ce{H2O}(l)\ce{NO2-}(aq)+\ce{H3O+}(aq). In an acidbase reaction, an acid plus a base reacts to form a conjugate base plus a conjugate acid. It turns out that fish have volatile amines (bases) in their systems, which are neutralized by the acids to yield involatile ammonium salts. The conjugate base of a strong acid has negligible acid-base properties. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Download for free at http://cnx.org/contents/85abf193-2bda7ac8df6@9.110). Determine the ionization constant of \(\ce{NH4+}\), and decide which is the stronger acid, HCN or \(\ce{NH4+}\). We can determine the relative acid strengths of \(\ce{NH4+}\) and HCN by comparing their ionization constants. These are known as polyprotic acids ("many proton" acids). And if we add a small amount of a base, the weak acid that's present will neutralize the hydroxide anions. If it has a bunch of hydroxide ions, it's a base. Carbonate ions from the carbonate react with hydrogen ions from the acid. Our stomachs contain a solution of roughly 0.03 M HCl, which helps us digest the food we eat. [1] Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic. Three varieties of Tums have calcium carbonate as the only active ingredient: Regular Tums tablets have 500 mg; Tums E-X, 750 mg; and Tums ULTRA, 1000 mg. Acids or bases with weak bonds easily dissociate into ions and are called "strong" acids or bases. However, the conjugate base of the weak acid is a weak base and ionizes slightly in water. If a conjugate base is classified as strong, it will "hold on" to the hydrogen proton when in solution and its acid will not dissociate. A weak acid plus a weak base can yield either an acidic, basic, or neutral solution. where the concentrations are those at equilibrium. These terms refer to the ratio of reactants to products in equilibrium when the acid or base reacts with water. Belmont: Thomson Higher Education, 2008. The strengths of Brnsted-Lowry acids and bases in aqueous solutions can be determined by their acid or base ionization constants. This increases the amount of hydroxide ion in the solution produced in the reaction and renders it slightly basic. What is citric acid plus. Last edited on 21 February 2023, at 02:22, "Strength of Conjugate Acids and Bases Chemistry Tutorial", MCAT General Chemistry Review - 10.4 Titration and Buffers. This is all just a different language for what you have already learned. It is formed by mixing CaO (quicklime, or calcium oxide) with H2O (water). Water is the base that reacts with the acid \(\ce{HA}\), \(\ce{A^{}}\) is the conjugate base of the acid \(\ce{HA}\), and the hydronium ion is the conjugate acid of water. Weak base:A compound is a weak base when it partially or not completely dissociates in an aqueous solution. \[\ce{H2CO3}(aq)+\ce{H2O}(l)\ce{H3O+}(aq)+\ce{HCO3-}(aq)\], \[K_{\ce{H2CO3}}=\ce{\dfrac{[H3O+][HCO3- ]}{[H2CO3]}}=4.310^{7}\]. I calculated n of calcium hydroxide: 0.0337 mol. Paul Flowers (University of North Carolina - Pembroke),Klaus Theopold (University of Delaware) andRichard Langley (Stephen F. Austin State University) with contributing authors. Uses of Calcium hydroxide It is used as the precursor to other calcium compounds. A byproduct of the pickling process changes the flavor of the vegetables with the acid making them taste sour. Milk of Magnesia is a suspension of the sparingly soluble base magnesium hydroxide, Mg(OH)2. The first six acids in Figure \(\PageIndex{3}\) are the most common strong acids. Write balanced chemical equations for neutralization reactions and determine if the resulting solution will be acidic, basic, or neutral. The burning sensation associated with heartburn is a result of the acid of the stomach leaking through the muscular valve at the top of the stomach into the lower reaches of the esophagus. Calcium hydroxide (slaked lime) is used in the manufacture of bleaching powder. It is used to clarify raw juice from sugarcanein thesugar industry. Is it correct to use "the" before "materials used in making buildings are"? A second common application with an organic compound would be the production of a buffer with acetic acid. It is also known as slaked lime. Paul Flowers (University of North Carolina - Pembroke),Klaus Theopold (University of Delaware) andRichard Langley (Stephen F. Austin State University) with contributing authors. A conjugate acid is formed by accepting a proton (H + ). In order for a species to have a strong conjugate base it has to be a very weak acid, like water for example. Common sense tells me it can't be the $\ce{Na+}$ ion, because it has no protons to donate, so how could it ever be an acid? Notice that the first ionization has a much higherKa value than the second. A strong base like sodium hydroxide (NaOH) will also dissociate completely into water; if you put in 1 mole of NaOH into water, you will get 1 mole of hydroxide ions.1, \[\ce{NaOH(aq) + H2O(l) <=> Na^{+}(aq) + OH^{-}(aq) + H2O(l)} \nonumber\], The terms "strong" and "weak" in this context do not relate to how corrosive or caustic the substance is, but only its capability to ionize in water. Hence, a large number of hydroxide ions present in the aqueous solution of Ca(OH)2, steadily increase the pH value and rises the effect of the basic in the solution. A stronger acid has a weaker conjugate base. You are told that all the base dissolves, which means that the solution contains twice as many moles of hydroxide anions, OH, as moles of calcium hydroxide used to make the solution. Example- Ammonia (NH3), Methylamine (CH3NH2), NH4OH,etc. It is used in the production of many plastics. A base is defined as a proton acceptor or lone pair donor. . An base dissociation constant(Kb) is a quantitative measure of the strength of an base in solution. Practically speaking, ifthe first ionization constantis larger than the second by a factor of at least 20, it is appropriate to treat the first ionization separately when performing equilibrium calculations on polyprotic acids, which simplifies those calculations significantly. For strong acids, you can calculate the pH by simply taking the negative logarithm of its molarity as it completely dissociates into its conjugate base and hydronium. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. What is the conjugate acid of NaOH using the Brnsted-Lowry definition of acids? Bases that are weaker than water (those that lie above water in the column of bases) show no observable basic behavior in aqueous solution. Charles Ophardt, Professor Emeritus, Elmhurst College. Ca(OH)2 is the strong base. web aug 21 2020 calcium hydroxide solution is referred to as lime water a liter of pure water will dissolve about 1 gram of calcium hydroxide at room . If a specific substance has many hydrogen ions, it is an acid. How can I check before my flight that the cloud separation requirements in VFR flight rules are met? As Ca2+ is a very weak conjugate acid of Ca(OH)2, hence it has no ability to react with either OH ion or with water molecules ions. Let us illustrate this system using the neutralization of hydrochloric acid with sodium hydroxide. When nitric acid and calcium hydroxide are combined, calcium nitrate and water are formed:Molecular Equation:2HNO3 + Ca (OH)2 -->Ca (NO3)2 + 2H2O (l)HNO3 is a strong acid.Ca (OH)2 is a. Home > Chemistry > Is Ca(OH)2 an acid or base? Published By Vishal Goyal | Last updated: December 30, 2022. The water molecule acts as a base because it receives the hydrogen cation (proton) and its conjugate acid is the hydronium ion (H3O+). Since 10pH = \(\ce{[H3O+]}\) , we find that \(10^{2.09} = 8.1 \times 10^{3}\, M\), so that percent ionization (Equation \ref{PercentIon}) is: Remember, the logarithm 2.09 indicates a hydronium ion concentration with only two significant figures. Acids such as \(\ce{HCl}\), \(\ce{HNO3}\), and \(\ce{HCN}\) can only donate one proton per molecule. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. Acid strength decreases and conjugate base strength increases down the table. not only neutralizes stomach acid, it also produces CO2(g), which may result in a satisfying belch. Theseare called monoprotic acids. 1. It is an inorganic compound which has a white, powdery appearance in its solid-state. Table \(\PageIndex{1}\). Also, the base dissociation constant value(Kb) for Ca(OH)2 is larger than 1. We will discover the relationship between molecular structure and acids-bases, and think about water solutions of acids and bases. The terms "strong" and "weak" give an indication of the strength of an acid or base. If we add a small amount of an acid, H+, to a buffer solution, the conjugate base that's present, A-, neutralizes the added acid. When Ca(OH)2 dissolved in water, it split into two ions Ca2+ and 2OH. Some salts formed in neutralization reactions may make the product solutions slightly acidic or slightly basic. Equation for Calcium Hydroxide Dissolving in Water | Ca (OH)2 + H2O Wayne Breslyn 634K subscribers 186K views 4 years ago In this video we will describe the equation Ca (OH)2 + H2O and write what. A solution is neutral when it contains equal concentrations of hydronium and hydroxide ions. So, Is Calcium hydroxide Ca(OH)2 strong base or a weak base? The light bulb circuit is incomplete. where each bracketed term represents the concentration of that substance in solution. In a buffer, a weak acid and its conjugate base (in the form of a salt), or a weak base and its conjugate acid, are used in order to limit the pH change during a titration process. For example, hydrofluoric acid is a weak acid1, but it is extremely dangerous and should be handled with great care. Yes, the conjugate base of the first reaction can also react with another water molecule, eg: H2SO4 + H2O -> HSO4- + H3O+ HSO4- + H2O -> SO4 2- + H3O+ H2SO4 and HSO4- are conjugate acid-base pairs, and HSO4- and SO4 2- are also conjugate acid-base pairs ( 7 votes) Darmon 6 years ago 2 years ago. The equilibrium constant for an acid is called the acid-ionization constant, Ka. The characteristic properties of aqueous solutions of Brnsted-Lowry acids are due to the presence of hydronium ions; those of aqueous solutions of Brnsted-Lowry bases are due to the presence of hydroxide ions. Finding pH of Calcium Hydroxide. Write the formula of the conjugate acid of (c) CH 3 NH 2 and (d) OH -. Calcium hydroxide is also used to clean the sulfur dioxide, which is caused by the exhaust, that is found in power plants and factories. It is poorly soluble in water. So, we can say Ca(OH)2 is the base. For polyprotic acids, successive ionizations become weaker in a stepwise fashion and can usually be treated as separate equilibria. Another measure of the strength of an acid is its percent ionization. If A is a stronger base, most protons that are donated to water molecules are recaptured by A. The larger the \(K_a\) of an acid, the larger the concentration of \(\ce{H3O+}\) and \(\ce{A^{}}\) relative to the concentration of the nonionized acid, \(\ce{HA}\). A solution of a weak acid reacts with a solution of a strong base to form the conjugate base of the weak acid and the conjugate acid of the strong base. It is used as a pH modifier. The acid and base in a given row are conjugate to each other. And when blue litmus paper turns red then the compound is said to be acidic. A cation can be a conjugate acid, and an anion can be a conjugate base, depending on which substance is involved and which acidbase theory is the viewpoint. Without the harmful bacteria consuming the cucumbers they are able to last much longer than if they were unprotected. In solutions of the same concentration, stronger bases ionize to a greater extent, and so yield higher hydroxide ion concentrations than do weaker bases. Are all solutions of weak acid/bases buffers? Adding these two chemical equations yields the equation for the autoionization for water: \[\cancel{\ce{HA}(aq)}+\ce{H2O}(l)+\cancel{\ce{A-}(aq)}+\ce{H2O}(l)\ce{H3O+}(aq)+\cancel{\ce{A-}(aq)}+\ce{OH-}(aq)+\cancel{\ce{HA}(aq)}\], \[\ce{2H2O}(l)\ce{H3O+}(aq)+\ce{OH-}(aq)\]. Acid and Base Strength is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. However, we can do better if we explicitly show the dissociation of $\ce{NaOH}$ as, and substitute that into the first expression (note that I write $\ce{2H2O}$ as $\ce{H2O + H2O}$) to get, $$\ce{Na+ + \underbrace{OH^{-}}_{base} + \underbrace{H3O^{+}}_{acid} -> Na+ + \underbrace{H2O}_{conjugate\;acid} + \underbrace{H2O}_{conjugate\;base}}$$. Hydrolysis of conjugate base of weak acid or conjugate acid of weak base takes place in . Hence, a conjugate base is a species formed by the removal of a proton from an acid, as in the reverse reaction it is able to gain a hydrogen ion. Similarly, the higher the Kb, the stronger the substance is as a base, and the more weakly acidic its conjugate acid is.1, For an acid that reacts with water in the reaction, \[HA_{(aq)} + H_2O_{(l)} \rightleftharpoons H_3O^+_{(aq)} + A^-_{(aq)}\]. are alkali metals. Hydrofluoric acid is particularly dangerous because it is capable of eating through glass, as seen in the video in the links sectionV1. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. A similar concept applies to bases, except the reaction is different. Nitric acid has the chemical formula HNO3, and Calcium Hydroxide has the chemical formula Ca (OH)2. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. They are less reactive compare to a strong base. A higher Ka value means a higher ratio of reactants to products, and so the acid with the higher Ka value will be producing more hydronium, and therefore have a lower pH. Strong bases react with water to quantitatively form hydroxide ions. However, wouldn't that mean that the conjugate acid of any base of the form. Acid or base "strength" is a measure of how readily the molecule ionizes in water. Figure \(\PageIndex{3}\) lists a series of acids and bases in order of the decreasing strengths of the acids and the corresponding increasing strengths of the bases. A weak base yields a small proportion of hydroxide ions. Do new devs get fired if they can't solve a certain bug? Therefore, in this system, most H+ will be in the form of a hydronium ion H3O+ instead of attached to a Cl anion and the conjugate base will be weaker than a water molecule. The vegetable, such as a cucumber, is placed in a sealed jar submerged in a brine solution. Molecular equation: HCl (aq) + NaOH (aq) ---> NaCl (aq) + H 2 O (l) So the molecular form of the equation is shown above. Alkali is a strong base that produces hydroxide ions when it is dissolved in water. The last bit - where water plays 2 roles - is due to water being amphoteric, or able to act as an acid or a base. HA(aq) + H 2O(l) H 3O + (aq) + A (aq) Water is the base that reacts with the acid HA, A is the conjugate base of the acid HA, and the hydronium ion is the conjugate acid of water. It ionizes and forms hydronium ions and carbonate ions in even smaller quantities. First week only $4.99! Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. The neutralization that occurs when aqueous solutions of acids and bases are combined results from the reaction of the hydronium and hydroxide ions to form water. One of the most common antacids is calcium carbonate, CaCO3. Does the term "Alkaline" necessarily indicate the presence of an actual alkali? There is a similar list of strong bases, ones that completely ionize into hydroxide ions and a conjugate acid. In a weak acid like hydrofluoric acid (HF), not all of the HF molecules split up, and although there will be some H+ and F- ions released, there will still be HF molecules in solution1. Skip to main content. \(K_{\ce{H2CO3}}\) is larger than \(K_{\ce{HCO3-}}\) by a factor of 104, so H2CO3 is the dominant producer of hydronium ion in the solution. The conjugate acid in the after side of an equation gains a hydrogen ion, so in the before side of the equation the compound that has one less hydrogen ion of the conjugate acid is the base. When hydrochloric acid reacts with hydroxide ion, water and chloride ion are formed. Consider the ionization reactions for a conjugate acid-base pair, HA A: \[\ce{HA}(aq)+\ce{H2O}(l)\ce{H3O+}(aq)+\ce{A-}(aq) \hspace{20px} K_\ce{a}=\ce{\dfrac{[H3O+][A- ]}{[HA]}}\], \[\ce{A-}(aq)+\ce{H2O}(l)\ce{OH-}(aq)+\ce{HA}(aq) \hspace{20px} K_\ce{b}=\ce{\dfrac{[HA][OH]}{[A- ]}}\]. These acids are completely dissociated in aqueous solution. All carbonates react in the same sort of way and that is because the same underlying bit of chemistry happens in each case. Tabulated below are several examples of acids and their conjugate bases; notice how they differ by just one proton (H+ ion). Exceed the buffer capacity 4. Depending on the acids and bases the salt that is formed can be neutral, acidic, or basic. Stronger acids form weaker conjugate bases, and weaker acids form stronger conjugate bases. The acidbase reaction can be viewed in a before and after sense. The element will replace the cation in the reacting compound and result in a new product for single replacement reactions. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If a species is classified as a strong acid, its conjugate base will be weak. This functions as such: Furthermore, here is a table of common buffers. Learn more about Stack Overflow the company, and our products. Example: Sodium hydroxide(NaOH), Barium hydroxide (Ba(OH)2), Lithium hydroxide (LiOH), Potassium hydroxide (KOH), etc. So, the higher the value of the base dissociation constant, the larger is the strength of a base in solution. Calculate the percent ionization of a 0.125-M solution of nitrous acid (a weak acid), with a pH of 2.09. Legal. Make sure that all of the compound formulas are correctly written based on the oxidation state of the elements involved. For an acid, the reaction will be HA + H2O --> A- + H3O+ . How to tell if compound is acid, base, or salt? A conjugate acid base pair are two substances related to each other by the transfer of a proton True The products of a neutralization reaction are carbon dioxide and water False A string acid is one that is very concentrated False A weak acid is a dilute acid that is not very powerful False Start your trial now! This is often sloppily used by organic chemists, and can lead to confusion, especially with amines. The strength of a conjugate base can be seen as the tendency of the species to "pull" hydrogen protons towards itself. When we have heartburn, it feels better if we reduce the excess acid in the esophagus by taking an antacid. Although water is a reactant in the reaction, it is the solvent as well, so we do not include [H2O] in the equation. Thus, only splitting ions(Ca2+ and 2OH) remain in the solution. The terms "acid", "base", "conjugate acid", and "conjugate base" are not fixed for a certain chemical species but are interchangeable according to the reaction taking place. In this article, we will discuss Is Calcium hydroxide (CaOH2) is acid or base? Thus there is relatively little A and \(\ce{H3O+}\) in solution, and the acid, HA, is weak. Find the pH of 0.5 grams of HCl disolved into 100 ml of water: 0.5 grams / (36.5 g/mole) = 0.014 moles HCl, HCl is a strong acid and completely dissociates in water, therefore the pH will be equal to the negative logarithm of the concentration of HCl. Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. In this case, the water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen ion donated by ammonium. C) Acids produce hydroxide ions. In chemical diagrams which illustrate this, the new bond formed between the base and the proton is shown by an arrow that conventionally starts on an electron pair from the base and whose arrow-head ends at the hydrogen ion (proton) that will be transferred: In this case, the water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen ion donated by ammonium. The resulting mixture is called an acetate buffer, consisting of aqueous CH3COOH and aqueous CH3COONa. So let's summarize how buffer solutions work. The most important buffer in our bloodstream is the carbonic acid-bicarbonate buffer, which prevents drastic pH changes when CO2 is introduced. Since HCl is a strong acid (it dissociates to a great extent), its conjugate base (Cl) will be a weak conjugate base. The chemical reactions and ionization constants of the three bases shown are: \[ \begin{aligned} \ce{NO2-}(aq)+\ce{H2O}(l) &\ce{HNO2}(aq)+\ce{OH-}(aq) \quad &K_\ce{b}=2.1710^{11} \\[4pt] \ce{CH3CO2-}(aq)+\ce{H2O}(l) &\ce{CH3CO2H}(aq)+\ce{OH-}(aq) &K_\ce{b}=5.610^{10} \\[4pt] \ce{NH3}(aq)+\ce{H2O}(l) &\ce{NH4+}(aq)+\ce{OH-}(aq) &K_\ce{b}=1.810^{5} \end{aligned}\]. The word neutralization seems to imply that a stoichiometrically equivalent solution of an acid and a base would be neutral. Their conjugate bases are stronger than the hydroxide ion, and if any conjugate base were formed, it would react with water to re-form the acid. Litmusis awater-solublemixture of differentdyesextractedfromlichens. Required fields are marked *. What is the pH of the solution of calcium hydroxide? When Ca(OH)2 is contacted with red litmus paper then litmus paper turns into blue color. There are a number of examples of acid-base chemistry in the culinary world. Answer: B acids are proton donors When HCl is added to pure water, HCl molecules lose protons, while water molecules gain protons. Ca(OH)2(s) Ca2+ (aq) + 2OH (aq) All acids have a conjugate base that forms when they react with water, and similarly, all bases have a conjugate acid that reacts when they form with water. The conjugate acid of \(\ce{NO2-}\) is HNO2; Ka for HNO2 can be calculated using the relationship: \[K_\ce{a}K_\ce{b}=1.010^{14}=K_\ce{w} \], \[K_\ce{a}=\dfrac{K_\ce{w}}{K_\ce{b}}=\dfrac{1.010^{14}}{2.1710^{11}}=4.610^{4} \], This answer can be verified by finding the Ka for HNO2 in Table E1. The bond strengths of acids and bases are implied by the relative amounts of molecules and ions present in solution. 2 is combined with sodium, calcium and potassium cations and chloride anions in distilled water . If the circuit is completed by a solution containing large numbers of molecules and either no ions or few ions, the solution does not conduct or conducts very weakly as shown for acetic acid. If acetic acid, a weak acid with the formula CH3COOH, was made into a buffer solution, it would need to be combined with its conjugate base CH3COO in the form of a salt. Ca (OH)2 (calcium hydroxide) is a strong base (which means it cannot be an acid). Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. This page titled 7.4: Acid-Base Neutralization is shared under a CC BY license and was authored, remixed, and/or curated by OpenStax. A weaker acid has a stronger conjugate base. 1 You can judge the relative strength of a conjugate by the \(K_a\) or \(K_b\) . 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