2021年4月28日 · There is a simple relationship between the magnitude of Ka for an acid and Kb for its conjugate base. Consider, for example, the ionization of hydrocyanic acid (HCN) in water to produce an acidic solution, and the reaction of CN − with water to produce a basic solution: HCN (aq) ⇌ H + (aq) + CN − (aq) CN − (aq) + H2O (l) ⇌ OH − (aq) + HCN (aq)

2024年5月25日 · Ka, pKa, Kb, and pKb are most helpful when predicting whether a species will donate or accept protons at a specific pH value. They describe the degree of ionization of an acid or base and are true indicators of acid or base strength because adding water to a solution will not change the equilibrium constant.

This is a calculator to calculate pKa, pKb, Ka, and Kb from any one of the listed four values. Kw is assumed to be 14.

Ka · Kb = Kw = 10-14. pKa + pKb = 14. First, remember that this relationship is only for a conjugate acid-base pair. You cannot randomly pick any acid and a base and use this correlation for your calculations. So, let’s see how they are derived by using as an example acetic acid (CH 3 CO 2 H) and its conjugate base acetate ion (CH 3 CO 2–).

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2020年4月15日 · The pH scale is the most familiar measure of acidity and basicity, but pKa, pKb, Ka, and Kb are better for predicting acid and base strength and their reactions. Here are definitions of each term, simple formulas used to calculate them, and an explanation of how they differ from one another.

酸的解离常数Ka=[A-][H+]/[HA]，由于Ka数值经常为10的n次方，运用时不方便，就诞生了pKa，pKa=-lgKa。 酸的定义为酸电离50%时的pH，此时酸与其共轭碱浓度相同，即[HA]=[A-]，则解离常数Ka=[A-][H+]/[HA]=[H+]，因此pKa=-lgKa=-lg[H+]=pH。

2020年1月23日 · You can go from pka to ka by taking 10 to the power of negative pka and when you found ka you can easily divide 10 to the power of negative 14 by ka to get kb

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2021年1月26日 · By understanding the math behind logarithms, Ka and Kb can be found from pKa or pKb. Ka represents the strength of an acidic solution, while Kb represents the strength of a basic solution.