What is the pH of millimolar solution of ammonium hydroxide which is 20% dissociated ?

The pH of 0.1 M ammonium hydroxide is

Find the pH of a solution of 0.01 M acetic acid which is only 20% ionised.

On adding ammonium chloride to a solution ammonium hydroxide

To a solution of ammonium hydroxide some solid ammonium chloride is added. Then

2 millimolar solution of sodium ferrocyanide is 60% dissociated at 27^@C Osmotic pressure of the solution is