Na2S i Fe(NO3)2
Na2S+Fe(NO3)2--->FeS↓+2 NaNO3
2 Na+ +S2- +Fe2+ +2 NO3- --->FeS↓ +2 Na+ +2 NO3-
S2- +Fe2+ --->FeS↓
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Na2S i Fe(NO3)2
Na2S+Fe(NO3)2--->FeS↓+2 NaNO3
2 Na+ +S2- +Fe2+ +2 NO3- --->FeS↓ +2 Na+ +2 NO3-
S2- +Fe2+ --->FeS↓