Answer true or false.
(a) Aqueous solutions of amines are basic.
(b) Aromatic amines such as aniline in general are weaker bases than aliphatic amines such as cyclohexanamine.
(c) Aliphatic amines are stronger bases than inorganic bases such as NaOH and KOH.
(d) Water-insoluble amines react with strong aqueous acids such as HCl to form watersoluble salts.
(e) If the pH of an aqueous solution of a 1° aliphatic amine, RNH2, is adjusted to pH 2.0 by the addition of concentrated HCl, the amine will be present in solution almost entirely as its conjugate acid, RNH3+.
(f) If the pH of an aqueous solution of a 1° aliphatic amine, RNH2, is adjusted to pH 10.0 by the addition of NaOH, the amine will be present in solution almost entirely as the free base, RNH2.
(g) For a 1° aliphatic amine, the concentrations of RNH3+ and RNH2 will be equal when the pH of the solution is equal to the pKb of the amine.
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