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

Or you want a quick look:

This is an oxidation-reduction (redox) reaction:

SII + 2 e- S (reduction)

SII - 2 e- SIV (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
  • H2SO4Sulfuric 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
  • H2SO3Sulfurous acid
    • Other names: S(O)(OH)2 , Sulphurous acid
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