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    Ka and Kb Relationship MCQ - Practice Questions with Answers

    Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

    Quick Facts

    • 6 Questions around this concept.

    Solve by difficulty

    QuestionMEDIUM

    Consider the following reaction, 

    ethanol $\xrightarrow{\mathrm{PBr}} \mathrm{X} \xrightarrow{\text { alc. } \mathrm{KOH}} \mathrm{Y} \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}, \text { heat }]{\text { (i) } \mathrm{H}_2 \mathrm{SO}_4 \text { room temperature }} \mathrm{Z}$

    the product Z is:

    View Solution

    Concepts Covered - 1

    Relation Between Ka, Kb and Kw for Conjugate Pair

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

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

    Thus, Ka x Kb = [H3O+][OH-] = Kw
    Thus, Ka ∝ 1/Kb at a given temperature

    Therefore, if Ka of acid increases, then Kb 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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    Books

    Reference Books

    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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