guys I am facing a problem while solving ionization/ dissociation related problems in equillibrium. In some cases in solutions they take inital concentration as (1-alpa)C where in some they directly write initial concentration alphaC pls help me how to solve for for these type 2 kinds of problems?

Hello,

You asked for the process of solution for the dissociation related problems in equilibrium.

Look, Ostwald’s dilution law is the application of the law of mass action to weak electrolytes in solution.

A binary electrolyte AB which dissociates into A ⁺ and B ^– ions.

AB A ⁺ + B ^–

(i) For very weak electrolytes, since α <<< 1, (1 – α) = 1

∴ K=C\alpha^{2}K=Cα2 \alpha = \sqrt{KV}α=KV

(ii) Concentration of any ion = Cα = √CK = √K/V

Degree of ionization increases on dilution. Thus, degree of dissociation of a weak electrolyte is proportional to the square root of dilution.

The law holds good only for weak electrolytes and fails completely in the case of strong electrolytes.

It becomes necessary to know what fraction of the initial amount of the reactants are converted into products at equilibrium.

The fraction of the initial molecules that are converted at equilibrium is called the degree of Dissociation/ionization.

Degree of dissociation or ionization = α = (Number of reactant molecules dissociated\ionized at the start)/(Number of reactant molecules at the start)

Degree of dissociation in Ionic equilibrium can be expressed in percentage.

% Degree of dissociation or ionization = α = (Number of reactant molecules dissociated or ionized at the start)/(Number of reactant molecules at the start) × 100

Hope this helps  !!

:)