CBSE Class 11-science Answered
Define ionization Constant? Show how can we derive expression for Ka for a weak acid like CH3COOH?
Asked by Topperlearning User | 16 Jun, 2016, 05:18: PM
Expert Answer
Ionization constant is the product of Equilibrium constant K and concentration of water term in an ionic equilibrium of a weak electrolyte.
We can derive an expression from the following ionic equilibrium of CH3COOH in water.
CH3COOH + H2O 
CH3COO- + H+
CH3COO- + H+Initial molar concentration C 0 0
Molar conc. at equilibrium point C(1 – α ) c α c α
Applying the law of chemical equilibrium
|
K =
|
[CH3COO-] [H+]
 [CH3COOH] [H2O] |
||
|
K [H2O] =
|
cα2
 (1–α ) |
||
cα2
Or, Ka =
(1 – α )
Or, Ka =
(1 – α )
Where K is equilibrium constant and Ka is known as ionization or dissociation constant of the acid, similarly a Kb expression can be derived for a weak base.
Answered by | 16 Jun, 2016, 07:18: PM
CBSE 11-science - Chemistry
Asked by sarojlaxmiacharjya | 03 Jan, 2022, 08:50: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by cjam41665 | 09 Oct, 2021, 11:11: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by rishika62124 | 03 Mar, 2021, 05:02: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by jyotijhajharia39 | 06 Jan, 2021, 11:41: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by nsaikumar33 | 15 Aug, 2020, 11:50: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by swati2678 | 10 Aug, 2020, 01:58: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by achamerahul2 | 17 Apr, 2020, 10:50: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by achamerahul2 | 17 Apr, 2020, 10:44: AM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by achamerahul2 | 14 Apr, 2020, 02:42: PM
ANSWERED BY EXPERTCBSE 11-science - Chemistry
Asked by SanskarAgarwal86 | 29 Feb, 2020, 04:36: AM
ANSWERED BY EXPERT
