S→K₂S→H₂S→SO₂→SO₃→NaHSO₄→Na₂SO₄
S+2K=K₂S
K₂S+2HCI=2KCI + H₂S
2K⁺+ S²⁻+2H⁺ + 2CI⁻ = 2K⁺ + 2CI⁻ + H₂S↑
S²⁻+2H⁺ = H₂S↑
H₂S⁻² + O₂⁰⇒H₂O⁻² +S⁺⁴O₂
S⁻² - 6e⁻⇒S⁺⁴ 6 2
12
2O⁰ +2x2e⁻⇒O⁻² 4 3
(H₂S)S⁻² восстановитель
(O₂)O⁻² окислитель
2H₂S + 3O₂ = 2H₂O + 2SO₂
2SO₂ + O₂ = 2SO₃
SO₃ + NaOH = NaHSO₄
SO₃ + Na⁺ +OH⁻= Na⁺ + HSO₄⁻
SO₃ + OH⁻ = HSO₄⁻
NaHSO₄ + NaOH = Na₂SO₄ + H₂O
Na⁺ + HSO₄⁻ + Na⁺ + OH⁻ = 2Na⁺ + SO₄²⁻ + H₂O
HSO₄⁻ + OH⁻ = SO₄²⁻ + H₂O