Can bằng

/ S+ O2 → SO2

2/ H2 + S → H2S

3/ 2K +S→ K2S

4/ H2S + 2KOH → K2S + H2O

5/ H2S + KOH → KHS + H2O

6/ H2S + CuSO4 → CuS ↓ + H2SO4

7/ H2S + 4Br2+ 4H2O→ H2SO4 + 8HBr