(a) What are the conjugate bases of the acids HF, [HSO4]–, [Fe(OH2)6]3+ and [NH4] +?
(b) What are the conjugate acids of the bases [HSO4]–, PH3, [NH2]– and [OBr]–?
(c) What is the conjugate acid of [VO(OH)]+?
(d) [Ti(OH2)6]3+ has a pKa value of 2.5. Comment on the fact that when TiCI3 dissolves in dilute hydrochloric acid, the main solution species is [Ti(OH2)6]3+
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