## Chemistry and Chemical Reactivity (9th Edition)

(a) $Ag_2CO_3$ (b) $PbCO_3$ (c) $AgCN$
(a) and (b) $CO_3^{2-}$ act as a weak base in water, following the reaction: $CO_3^{2-}(aq) + H_2O(l) \lt -- \gt HCO_3^-(aq) + OH^-(aq)$ Since the carbonate ion is being consumed, its concentration will decrease, increasing the solubility of the salts. (c) The same will occur with the $CN^-$ ion, which is also a base. $CN^-(aq) + H_2O(l) \lt -- \gt HCN(aq) + OH^-(aq)$