• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar

Class Notes

Free Education for All

  • Class 1-5
  • Class 6
  • Class 7
  • Class 8
  • Class 9
  • Class 10
  • Class 11
  • Class 12
  • NCERT Solutions
    • NCERT Books
Home » Class 11 » Chemistry » Ionic Equilibrium » Calculation Of Hydrolysis Constant, Degree of hydrolysis and pH of salt solution

Calculation Of Hydrolysis Constant, Degree of hydrolysis and pH of salt solution

Last Updated on May 3, 2020 By Mrs Shilpi Nagpal 7 Comments

Salt of weak acid and strong base

a) Hydrolysis Constant

Hydrolysis constant

Relation between kh, Kw, Ka

b) Degree of Hydrolysis

A‾ + H2O sign of equilibrium reactionOH‾ + HA

c                       0         0             original molar conc

c(1-h )             ch         ch          Molar conc at equilibrium

Degree of hydrolysis

salt of weak acid and strong base

c) pH

pH of salt of weak acid and strong base

Salt of strong acid and weak base

a) Hydrolysis Constant

BA + H2O sign of equilibrium reaction BOH + HA

B+ + A‾ + H2O sign of equilibrium reaction BOH + H+ + A‾

B+ + H2O sign of equilibrium reaction BOH + H+

Degree of hydrolysis

hydrolysis constant

b) Degree of Hydrolysis

degree of hydrolysis of SA and WB

c) pH

B+ + H2O sign of equilibrium reaction BOH + H+

c                         0         0         original conc

c(1-h)                 ch        ch      conc at equilibrium

conc of hydrogen  = ch = (Kw /Kb.c ) ½= (Kw .c /Kb)½ = (Kw .c /Kb )½

pH = – log conc of hydrogen 

pH = -log (Kw .c /Kb )½

pH = -½ ( log Kw -log Kb + log c )

pH = ½ ( pKw -pKb – log c)

pH = 7 – ½(pKb + log c)

Salts of weak acid and weak base

a) Hydrolysis constant

Hydrolysis constant

Kh = Kw / Ka .Kb

b) Degree of Hydrolysis

degree of hydrolysis

degree of hydrolysis of wa and wb

c) pH

HA sign of equilibrium reactionH+ + A‾

Ka

conc of hydrogen = Ka (HA / A‾)

conc of hydrogen  = Ka (ch / c(1-h))

conc of hydrogen = Ka (h /1-h)

√Kh = (h /1-h)

conc of hydrogen  = Ka √Kh =Ka  (Kw/ Ka .Kb)½ = (Ka .Kw /Kb)½

pH = -log conc of hydrogen

pH = – log (Ka .Kw /Kb)½

pH = -½( log Ka + log Kw -log Kb)

pH =½ (pKw +pKa -pKb)

pH = 7 + ½ (pKa – pKb)

If pKa < pKb , pH of the solution will be less than 7 and the solution will be acidic.

If pKa > pKb , pH of the solution will be greater than 7 and the solution will be basic.

If pKa = pKb , pH of the solution will be equal to 7 and the solution will be neutral.

Filed Under: Chemistry, Class 11, Ionic Equilibrium Tagged With: degree of hydrolysis of Salt of strong acid and weak base, degree of hydrolysis of Salt of weak acid and strong base, degree of hydrolysis of Salts of weak acid and weak base, degree of hydrolysis of weak acid and weak base, Hydrolysis constant of Salt of strong acid and weak base, Hydrolysis constant of Salts of weak acid and weak base, hydrolysis constant of weak acid and strong base, pH of Salt of weak acid and strong base, pH Salt of strong acid and weak base, pH Salts of weak acid and weak base

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. Shuvam panigrahi says

    December 16, 2018 at 1:16 pm

    Nyccc thanxxx a lot

    Reply
  2. Andualem Koriya says

    December 27, 2018 at 12:09 am

    10Q so much
    I got the answer of my question

    Reply
  3. Sai Charan says

    April 9, 2019 at 3:24 pm

    It’s awesome.
    I have been searching for many days for these formulas.Thank u very much I will be following u from now onwards.

    Reply
    • Krishna says

      October 15, 2019 at 6:27 pm

      This is Awesome i really want this site in an app thank you

      Reply
  4. raju says

    September 4, 2019 at 8:14 am

    Good work sister

    Reply
  5. Supriya says

    October 2, 2019 at 7:55 pm

    Thank you .

    Reply
  6. Kritika salaria says

    January 17, 2021 at 11:46 pm

    Thanks a lot………

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Recent Posts

  • Terms used in Coordination compounds
  • Werner’s Coordination Theory
  • Coordination Compounds
  • Vowels and Consonants
  • Economics Chapter 5 Consumer Rights – Notes & Study Material
  • Prefix and Suffix
  • Economics Chapter 4 Globalisation and The Indian Economy – Notes & Study Material
  • Diphthongs
  • Economics Chapter 3 Money and Credit – Notes & Study Material
Copyright © 2016-2021 | About Us | Contact Us | Privacy Policy | Facebook | Pinterest | Twitter