Question

What will you observe when H₂S gas is passed through copper sulphate solution?

Answer 1

• When H₂S gas is passed through copper sulphate solution, a black precipitate of copper sulphide (CuS) is formed.

$$\begin{gathered} {\mathrm{CuSO}}_4\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)\to \mathrm{CuS}\left(\mathrm{s}\right)(\downarrow )+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right) \\ \mathrm{Copper}\mathrm{sulphate}\mathrm{Hydrogen}\mathrm{sulphide}\mathrm{Copper}\mathrm{sulphide}\mathrm{Sulphuric}\mathrm{acid} \end{gathered}$$