Careers360 Logo
Search Colleges, Exams, Schools & more
ask-icon
share
    NIT JEE Main Cutoff 2026 (Out) - NIT BTech Admission Process
    1. Home
    2. JEE Main
    3. Study Material
    4. Ka and Kb Relationship - Practice Questions & MCQ

    Ka and Kb Relationship - Practice Questions & MCQ

    Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

    Quick Facts

    • 11 Questions around this concept.

    Solve by difficulty

    QuestionEASY

    The pH of 1N aqueous solutions of HCl, CH3COOH and HCOOH follows the order

    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, \mathrm{K}_{\mathrm{a}} \times \mathrm{K}_{\mathrm{b}}=\left[\mathrm{H}_3 \mathrm{O}^{+}\right]\left[\mathrm{OH}^{-}\right]=\mathrm{K}_{\mathrm{w}}
    Thus, \mathrm{K}_{\mathrm{a}} \propto 1 / \mathrm{K}_{\mathrm{b}} 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.

    Study it with Videos

    Relation Between Ka, Kb and Kw for Conjugate Pair

    Study other Related Concepts

    Ka and Kb Relationship Current Topic

    Equilibrium
    Law Of Mass Action
    Equilibrium Constant
    Relation between Kp and Kc
    Degree of Dissociation
    Le Chatelier's Principles on Equilibrium
    Ionic Equilibrium
    Bronsted Lowry and Lewis Acid-Base theory
    Ionization Of Acids And Bases
    Ka and Kb Relationship

    "Stay in the loop. Receive exam news, study resources, and expert advice!"

    Books

    Reference Books

    Relation Between Ka, Kb and Kw for Conjugate Pair

    Chemistry Part I Textbook for Class XI

    Page No. : 222

    Line : 22

    Clear your Basics with NCERT

    E-books & Sample Papers

    JEE Main Chapter Wise PYQs

    40234+ Downloads

    Get Answer to all your questions

    B.Tech/B.Arch Admissions OPEN

    Amity University Noida-B.Tech Admissions 2026
    Apply

    This round of applications closing on 15th July | Among top 100 Universities Globally in the Times Higher Education (THE) Interdisciplinary Science Rankings 2026

    GMRIT Deemed to be University B.Tech Admissions 2026
    Apply

    100+ Recruiters | 1200+ Placements of 2026 Batch | NBA & NAAC Accredited | Highest CTC 37 LPA

    Atria Institute of Technology - B.E. Admissions 2026
    Apply

    NAAC A++ Grade | Highest Package-30 LPA | 400+ Recruiters

    Shoolini University Admissions 2026
    Apply

    NAAC A+ Grade | Ranked 503 Globally (QS World University Rankings 2026)

    Geeta University B.Tech Admissions 2026
    Apply

    40 LPA Highest Package | Up to 100% Scholarship worth 24 Crore via GUTS exam

    UPES B.Tech Admissions 2026
    Apply

    Last Date to Apply: 15th July | Ranked #43 among Engineering colleges in India by NIRF | Get Upto 100% Scholarships | Spot Admissions via CUET

    View all Application Forms

    Student Community: Where Questions Find Answers

    Ask and get expert answers on exams, counselling, admissions, careers, and study options.
    Download Careers360 App
    All this at the convenience of your phone

    • Regular Exam Updates

    • Best College Recommendations

    • College & Rank predictors

    • Detailed Books and Sample Papers

    • Question and Answers

    Scan and download the app

    OR

    College Predictor