Tasks and exercises
1.
From what acid and what base were the following salts made:
CaSO4, NH4Br, and BaCl2?
2.
Tell whether 0.1 M solutions of the following salts would be
acidic, neutral, or basic: BaCl2, CuS04,
(NH4)2S04, ZnCl2,
NaCN.
3.
How should the pH of a 0.1 M solution of
NaC2H302 compare with that of a 0.1 M
solution of KC2H302? Explain
briefly.
4.
What is the pH of a 0.1
mol/L solution of NaCN?
5.
Calculate the [OH-], pOH and pH of these solutions: a) 0.50 mol/L KCN; b) 0.20 mol/L
NaClO.
6.
Calculate the pH of a 0.20 M solution of ammonium chloride,
Kb = 1.8 × 10–5.
7.
A 0.02 M solution of sodium acetate in water at 25°C has a hydrogen
ion concentration of 3 × 10–9 M. What is the hydrolysis constant of
the salt?
8.
Calculate the pH of a decinormal solution of ammonium chloride.
(pKa = 5.7 and pKw = 14
9.
20 ml of 0.2 M NaOH solution be treated with 40 ml of 0.2 M acetic
acid solution to give 70 ml. Calculate the pH of the
solution.
10. Aniline is an amine that is used to manufacture dyes. It is isolated
as aniline hydrochloride, [C6H5NH3+]Cl, a salt prepared by the reaction of the weak base aniline and
hydrochloric acid. What is the pH of a 0.233 M solution of aniline hydrochloride?
C6H5NH3+ (aq) + H2O (l) → H3O+ (aq) + C6H5NH2 (aq)