Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 17

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Chemistry Class 11 NCERT Solutions Chapter 7 Equilibrium Part 17

Q: 45. The first ionization constant of is . Calculate the concentration of 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 is calculate the concentration of under both conditions.

Answer:

(i) To calculate the concentration of ion:

Case I (in the absence of HCl):

Let the concentration of x M.

Then,

Taking we have

Case II (in the presence of HCl):

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

Also,

Now,

(ii) To calculate the concentration of :

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

(From first ionization, case I)

Let be X.

Also, (From first ionization, case I)

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

(From first ionization, case II)

(From HCl, case II)

Then,