Ionization of Polybasic Acids Class 11 Notes | EduRev

Chemistry for JEE

Class 11 : Ionization of Polybasic Acids Class 11 Notes | EduRev

The document Ionization of Polybasic Acids Class 11 Notes | EduRev is a part of the Class 11 Course Chemistry for JEE.
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Dissociation constants of acids and Bases

(1) Dissociation constant for weak acid: Consider an acid HA which, when dissolved in water ionizes as, 

Ionization of Polybasic Acids Class 11 Notes | EduRev

Applying the law of mass action, 
Ionization of Polybasic Acids Class 11 Notes | EduRev

Where, Ionization of Polybasic Acids Class 11 Notes | EduRev is the dissociation constant of the acid, Ionization of Polybasic Acids Class 11 Notes | EduRev. It has constant value at definite temperature and does not change with the change of concentration.

Dissociation Constant for polybasic acid: Polybasic acids ionise stepwise as, for example, orthophosphoric acid ionises in three steps and each step has its own ionisation constant.

Ionization of Polybasic Acids Class 11 Notes | EduRev ⇌ Ionization of Polybasic Acids Class 11 Notes | EduRev (I step)

Ionization of Polybasic Acids Class 11 Notes | EduRev ⇌ Ionization of Polybasic Acids Class 11 Notes | EduRev (II step)

Ionization of Polybasic Acids Class 11 Notes | EduRev ⇌ Ionization of Polybasic Acids Class 11 Notes | EduRev (III step)

Let Ionization of Polybasic Acids Class 11 Notes | EduRev and Ionization of Polybasic Acids Class 11 Notes | EduRev be the ionization constants of first, second and third steps respectively. Thus,

Ionization of Polybasic Acids Class 11 Notes | EduRev

In general, Ionization of Polybasic Acids Class 11 Notes | EduRev

The overall dissociation constantIonization of Polybasic Acids Class 11 Notes | EduRev is given by the relation,

Ionization of Polybasic Acids Class 11 Notes | EduRev

(2) Dissociation constant for weak base: The equilibrium of Ionization of Polybasic Acids Class 11 Notes | EduRev (a weak base) can be represented as,

Ionization of Polybasic Acids Class 11 Notes | EduRev ⇌ Ionization of Polybasic Acids Class 11 Notes | EduRev

Applying the law of mass action,

Ionization of Polybasic Acids Class 11 Notes | EduRev

Ionization of Polybasic Acids Class 11 Notes | EduRev is constant at a definite temperature and does not change with the change of concentration.

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