SnCl2+A→SnS+2HCl
SnS+(NH4)2S+S→B
Here A and B is:
On passing H2S gas through aqueous solution of stannous chloride, yellow precipitate of SnS is formed. SnS dissolves in yellow ammonium sulphide [(NH4)2S+S].
SnCl2+H2S→SnS+2HCl
SnS+(NH4)2S+S→(NH4)2SnS3
Ammonium thiostannate