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Which of the following will be more soluble in an acidic solution than in pure water?
Ag2S, KClO4, CaCO3, AgCl, Ni(OH)2
♦ Relevant knowledgeAcidic solutions are those where the amount of hydrogen ions surpasses the number of hydroxide ions. A solution classified as acidic is one in which the concentration of hydrogen ions is higher than the hydroxide ion’s concentration.
Answer: Ag2S, CaCO3 and Ni(OH)2
Salts with basic anions will be more easily soluble in acidic solutions than pure water.
S2-, CO32-, and OH- ions are basic anions. They give strong base OH- in aqueous solutions, as shown below.
S2-(aq) + H2O(l) <=> HS-(aq) + OH-(aq)
OH-(aq) + H2O(l) <=> H2O(l) + OH-(aq)
CO32-(aq) + H2O(l) <=> HCO3–(aq) + OH-(aq)
ClO 4– and Cl- are weak conjugate bases for strong acids HClO4 and HCl respectively.