Write the reaction equation: S – H2SO4 – H2S – KHS – H2S – Na2S – CuS

1. The reaction of sulfur with nitric acid to form sulfuric acid.
S + 2HNO3 = 2NO + H2SO4.
2. Concentrated sulfuric acid with zinc react with the release of hydrogen sulfide.
5H2SO4 + 4Zn = 4ZnSO4 + H2S + 4H2O.
3. Formation of an acidic salt at a reagent ratio of 1: 1.
H2S + KOH = KHS + H2O.
4. Reaction of potassium hydrosulfide with sulfuric acid.
2KHS + H2SO4 = 2H2S + K2SO4.
5. With an excess of alkali, sulfide is formed.
H2S + 2NaOH = Na2S + 2H2O.
6. The reaction of exchange of copper chloride and sodium sulfide.
Na2S + CuCl2 = 2NaCl + CuS.




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