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