Question

he reaction below demonstrates which characteristic of a base?

Upper C U upper S upper O subscript 4 (a q) plus 2 upper N a upper O upper H (a q) right arrow upper C u (upper O upper H) subscript 2 (s) plus upper N a subscript 2 upper S upper O subscript 4 (a q).
the ability of bases to release sodium ions into solution
the ability of bases to release hydrogen ions into solution
the ability of a base to react with carbonate or bicarbonate
the ability of a base to react with a soluble metal salt

Answer 1

ability of a base to react with a soluble metal salt

Reason: OH− from NaOH reacts with Cu2+ to form the insoluble metal hydroxide Cu(OH)2. Na+ and SO4^2− are spectator ions (form Na2SO4 in solution). This is not release of H+ (that’s an acid), nor reaction with carbonate.