H2S → K2S → KHS → K2S → CuS → SO2
→ ZnSO3 → SO2;
K + H2S = K2S + H2
K2S + H2S = 2KHS
KHS + KOH = K2S + H2O
K2S + CuCl2 = CuS + 2KCl
CuS + O2= CuO + SO2
ZnO + SO2 = ZnSO3
ZnSO3= ZnO + SO2 прокаливание
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