Question

When ${\mathrm{H}}_2\mathrm{S}$ gas is bubbled through an aqueous solution of Copper(II) sulphate, a black precipitate of $\mathrm{CuS}$ is obtained. Write a balance reaction.

Answer 1

1. When ${\mathrm{H}}_2\mathrm{S}$ gas is bubbled through an aqueous solution of Copper(II) sulphate, a black precipitate(an insoluble substance generally formed during ) of $\mathrm{CuS}$ is obtained.
2. The balanced reaction for this can be given as: $$\begin{gathered} {\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to \mathrm{CuS}\left(\mathrm{s}\right)\downarrow +{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right) \\ (\mathrm{Hydrogen}\mathrm{sulphide})\left(\mathrm{Copper}\right(\mathrm{II}\left)\mathrm{sulphate}\right)\underset{\mathrm{Black}\mathrm{in}\mathrm{color}}{\underbrace{(\mathrm{Copper}\mathrm{sulphide})}}(\mathrm{Sulphuric}\mathrm{acid}) \end{gathered}$$.