Question

hydrolysis: KF, NaNO, NHNO, MgSO4, KCN, CH COONa, RbI, Na CO,, CaCl, HCOOK. ent Computational Problems 16.94 Calculate the pH of a 0.36 M CH3COONa solution. (K, for acetic acid = 1.8 x 10-.) 16.95 Calculate the pH of a 0.42 M NH Cl solution. (K, for ammonia = 1.8 x 10-9.) 16.96 Calculate the pH of a 0.082 M NaF solution. (K, for HF = 7.1 x 10-4.) 16.97 Calculate the pH of a 0.91 M C H5NH2I solution. (Kfor C2H5NH2 = 5.6 x 10-4.) Conceptual Problems
16.95

Answer 1

• NH4Cl is a salt of weak base and strong acid. In aqueous solution, the ammonium ion(NH4+) ion hydrolyses to give an acidic solution-

Ич Hydrolysis : Nuent caq) + Hyoces = nHyon (aq) + H+ (aq) PKO of NH3 = -log Kb = -log 1.8 *105 = 4.74 concentration (C) of salt = 0.42 M Now, pH = 7 - 1 2 (pkb + log c) = 7-_(4.74 + log 0.42) = [pH = 4.8