Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 17 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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,

Developed by: