(a) 4.0 x 10 (b) 3.2 x 10 (c) 2.5x 10 E) 2.0 10 21. At 298 K, 0.1 mol of ammonia acetate and 0.14 mol of acetic acid are dissolved in 1 L of water. The pH of the resulting solution is [Given, pk, of acetic acid is 4.75] (a) 4.9 (b) 4.6 (c) 4.3 (d) 2.3 22 The number of degree of freedom of liquid water in equilibrium with ice is: