| (1) $\text{CaCO}_3$ | (2) $\text{CuSO}_4$ | (3) $\text{Fe(NO}_3)_2$ | (4) $\text{NaHCO}_3$ |
\textbf{223-} By adding a sufficient amount of sodium hydroxide solution to a pure solid sample of one substance, this substance reacts and forms only one colorless solution. Which compound can this solid be?
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(1) $\text{CaCO}_3$ & (2) $\text{CuSO}_4$ & (3) $\text{Fe(NO}_3)_2$ & (4) $\text{NaHCO}_3$
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