Question

The 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

The ability of a base to react with a soluble metal salt.

Explanation: NaOH provides OH− ions that react with Cu2+ from CuSO4 to form insoluble Cu(OH)2 precipitate. The other choices are incorrect: releasing hydrogen ions is an acid property, releasing sodium ions is not a general base characteristic, and reaction with carbonate/bicarbonate is not shown here.