Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 22

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Q: 59. The ionization constant of Propionic acid is . Calculate the degree of ionization of the acid in its 0.05M solution and also its pH. What will be its degree of ionization if the solution is 0.01M in HCl also?

Answer:

Let the degree of ionization of propionic acid be α.

Then, representing propionic acid as HA, we have

Then,

In the presence of 0.1M of HCl, let be the degree of ionization

Then,

Q: 60. The pH of 0.1M solution of cyanic acid (HCNO) is 2.34. Calculate the ionization constant of the acid and its degree of ionization in the solution.

Answer:

Also,

Then,

Q: 61. The ionization constant of nitrous acid is . Calculate the pH of 0.04 M sodium nitrite solution and also its degree of hydrolysis.

Answer:

is the salt of a strong base (NaOH) and a weak acid

Now, if x moles of the salt undergo hydrolysis, then the concentration of various species Present in the solution will be

Therefore, degree of hydrolysis

=