Ka and Kb Relationship MCQ - Practice Questions & Answers

Modern Physics Chapters for NEET 2025 - Modern Physics Topics

Quick Facts

7 Questions around this concept.

Solve by difficulty

Consider the following reaction,

ethanol $\overset{PBr}{\to} X \overset{alc. KOH}{\to} Y \to_{(ii) H_{2} O, heat}^{(i) H_{2} {SO}_{4} room temperature} Z$

the product Z is:

A

CH₃CH₂ - O - CH₂ - CH₃

B

CH₃ - CH₂ - O - SO₃H

C

CH₃CH₂OH

D

CH₂ = CH₂

Concepts Covered - 1

Relation Between Ka, Kb and Kw for Conjugate Pair

The relation between K_a,K_b and K_w can be understand by the following reaction.
$\mathrm{NH_{3}\: +\: H_{2}O\: \rightleftharpoons \: NH_{4}^{+}\: +\: OH^{-}}$
Base Conjugate acid

The equilibrium constant K_b for base NH₃ is given as:
$\mathrm{K_{b}\: =\: \frac{[NH_{4}^{+}][OH^{-}]}{NH_{3}}}$
Again, the reaction is:
$\mathrm{NH_{4}^{+}\: +\: H_{2}O\: \rightleftharpoons \: NH_{3}\: +\: H_{3}O^{+}}$

The equilibrium constant K_a for conjugate acid NH₄⁺ is given as:
$\mathrm{K_{a}\: =\: \frac{[NH_{3}][H_{3}O^{+}]}{NH_{4}^{+}}}$

Thus, K_a x K_b = [H₃O⁺][OH^-] = K_w
Thus, K_a ∝ 1/K_b at a given temperature

Therefore, if K_a of acid increases, then K_b of the conjugate base decreases. In other words, the conjugate base of strong acid is a weak base and vice-versa.

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Relation Between Ka, Kb and Kw for Conjugate Pair

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Relation Between Ka, Kb and Kw for Conjugate Pair

Chemistry Part I Textbook for Class XI

Page No. : 222

Line : 22

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