Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 19

Chemistry Class 11 NCERT Solutions Chapter 7 Equilibrium Part 19

Q: 51. The pH of 0.005M codeine Equation solution is 9.95. Calculate its ionization constant and Equation .

Answer:

C = 0.005

pH = 9.95

pOH = 4.05

pH = -log (4.105)

Equation

Equation

Equation

Equation

Thus, Equation

Equation

Equation

Equation

Equation

Equation

Equation

= 5.80

Q: 52. What is the pH of 0.001 M aniline solution? The ionization constant of aniline can be taken from Table 7.7. Calculate the degree of ionization of aniline in the solution. Also calculate the ionization constant of the conjugate acid of aniline

Answer:

Equation

Equation

Equation

Equation

Equation

Equation

Equation

Equation

Then, Equation

Equation

Equation

Equation

Equation

Now,

Equation

Equation

Equation

Equation

Thus, the ionization constant of the conjugate acid of aniline is Equation

Q: 53. Calculate the degree of ionization of 0.05M acetic acid if its Equation value is 4.74. How is the degree of dissociation affected when its solution also contains (A) Equation (B) Equation ?

Answer:

Equation

Equation

Equation

Equation

Equation

Equation

When HCl is added to the solution, the concentration of Equation ions will increase. Therefore, the equilibrium will shift in the backward direction i.e., dissociation of acetic acid will decrease.

Case I: When 0.01 M HCl is taken

Let x be the amount of acetic acid dissociated after the addition of HCl.

Equation

As the dissociation of a very small amount of acetic acid will take place, the value i.e., 0.05-x and 0.01+ x can be taken as 0.05 and 0.01 respectively.

Equation

Equation

Equation

Equation

Now,

Equation

Equation

Equation

Case II: When 0.1 M HCl is taken.

Let the amount of acetic acid dissociated in this case be X. As we have done in the first case, the concentrations of various species involved in the reaction are:

Equation

Equation

Equation

Equation

Equation

Equation

Equation

Now,

Equation

Equation

Equation

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