B. Salts That Yield Acidic Solutions: (1) the anion of a strong acid
and the cation of a weak base (the cation acts as a weak acid); (2) small, highly charged metal ions; (3) cations of strong bases and anions of polyprotic acids with another ionizable proton.
NH4Cl(s) NH4+ (aq) + Cl-(aq)
NH4+(aq) + H2O(l) NH3(aq) + H3O+ (aq)
Case 1
Fe(NO3)3(s) + 6H2O(l) Fe(H2O)63+(aq) + 3NO3-(aq)
Fe(H2O)63+(aq) + H2O(l) Fe(H2O)5OH2+(aq) + H3O+(aq)
Case 2
NaH2PO4(s) Na+(aq) + H2PO4- (aq)
H2PO4-(aq) + H2O(l) HPO42-(aq) + H3O+(aq)
Case 3
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