1) S → SO₂ → H₂SO₃ → Na₂SO₃:
Sulfur (S) → Sulfur dioxide (SO₂) → Sulfurous acid (H₂SO₃) → Sodium sulfite (Na₂SO₃)
2) K → K₂O → KOH → K₃PO₄:
Potassium (K) → Potassium oxide (K₂O) → Potassium hydroxide (KOH) → Potassium phosphate (K₃PO₄)
1) S → SO₂ → H₂SO₃ → Na₂SO₃:
Sulfur (S) → Sulfur dioxide (SO₂) → Sulfurous acid (H₂SO₃) → Sodium sulfite (Na₂SO₃)
2) K → K₂O → KOH → K₃PO₄:
Potassium (K) → Potassium oxide (K₂O) → Potassium hydroxide (KOH) → Potassium phosphate (K₃PO₄)