Схема превращения:
S - H2S - Na2S - FeS - H2S
H2 + S = H2S
H2S + 2NaOH(конц.) = Na2S + 2H2O
FeCl2 + Na2S = FeS↓ + 2NaCl
FeS + 2HCl(разб.) = FeCl2 + H2S↑
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H2 + S = H2S
H2S + 2NaOH(конц.) = Na2S + 2H2O
FeCl2 + Na2S = FeS↓ + 2NaCl
FeS + 2HCl(разб.) = FeCl2 + H2S↑