Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 17

Chemistry Class 11 NCERT Solutions Chapter 7 Equilibrium Part 17

Q: 45. The first ionization constant of Equation is Equation . Calculate the concentration of Equation ion in its 0.1 M solution. How this concentration be affected if the solution is 0.1 M in HCl also? If the second dissociation constant of Equation is Equation calculate the concentration of Equation under both conditions.

Answer:

(i) To calculate the concentration of Equation ion:

Case I (in the absence of HCl):

Let the concentration of Equation x M.

Equation

Then, Equation

Equation

Equation

Taking Equation we have Equation

Equation

Equation

Equation

Equation

Case II (in the presence of HCl):

In the presence of 0.1 M of Equation , let Equation be y M.

Equation

Also,

Equation

Now, Equation

Equation

Equation

Equation

Equation

Equation

(ii) To calculate the concentration of Equation :

Case I (in the absence of 0.1 M HCl):

Equation

Equation (From first ionization, case I)

Let Equation be X.

Also, Equation Equation (From first ionization, case I)

Equation

Equation

Equation

Case II (in the presence of 0.1 M HCl):

Equation (From first ionization, case II)

Equation (From HCl, case II)

Equation

Then, Equation

Equation

Equation

Equation

Equation

Equation

Equation

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