H2S + CUSO4→ CUS ↓ + H2SO4 7/ H2S +4BR2+4H2O → H2SO4+ 8HBR

6/ H

2

S + CuSO

4

→ CuS ↓ + H

2

SO

4

7/ H

2

S +4Br

2

+4H

2

O → H

2

SO

4

+ 8HBr