Na2S2O3 + H2SO4 → S + Na2SO4 + H2SO3 – Balanced equation

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This is an oxidation-reduction (redox) reaction:

S^II + 2 e^- → S (reduction)

S^II - 2 e^- → S^IV (oxidation)

Na₂S₂O₃ is both an oxidizing and a reducing agent (disproportionation (dismutation)).

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Reactants:

Na₂S₂O₃
- Names: Sodium thiosulfate , Sodium hyposulfite , Hyposulphite of soda
- Appearance: White crystals ; Colourless crystals
H₂SO₄ – Sulfuric acid
- Other names: Oil of vitriol , Sulfuric acid, concentrated (> 51% and , H2SO4
- Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]

Products:

S
- Names: Sulfur , S , Sulphur
- Appearance: Yellow solid in various forms
Na₂SO₄
- Names: Sodium sulfate , Sodium sulphate , Sulfate of sodium
- Appearance: White crystalline solid | hygroscopic ; White hygroscopic solid in various forms
H₂SO₃ – Sulfurous acid
- Other names: S(O)(OH)2 , Sulphurous acid