CH-1958

Balancing equations

Chemistry · Secondary 4 · Medium · Balancing equations

Aqueous sodium hydroxide is added to aqueous copper(II) sulfate until in excess. A blue precipitate forms. Which ionic equation correctly represents the formation of this precipitate?

$\text{Cu}^{2+}(aq) + 2\text{OH}^-(aq) \rightarrow \text{Cu(OH)}_2(s)$
$\text{Cu}^{2+}(aq) + \text{OH}^-(aq) \rightarrow \text{CuOH}^+(aq)$
$\text{Cu(OH)}_2(aq) \rightarrow \text{Cu}^{2+}(aq) + 2\text{OH}^-(aq)$
$\text{Cu}^{2+}(aq) + 2\text{Na}^+(aq) \rightarrow \text{CuNa}_2^{2+}(aq)$

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