H2S2O8 - Peroxydisulfuric Acid

What is Peroxydisulfuric Acid?

Peroxydisulfuric Acid is a colourless solid and one of the most powerful peroxyacid oxidants available. Peroxydisulfuric Acid is an inorganic compound with the chemical formula H2S2O8. It can be generated from potassium or ammonium persulfate in acidic solution. It is an anhydride of sulphuric and peroxydisulfuric acid and may be prepared by oxidation of oleum with ozone or hydrogen peroxide. Also called Marshall’s acid, peroxydisulfuric acid can be produced by electrolyzing an aqueous solution containing sulfate ions in an electrolysis reactor should be produced by electrolyzing.

Other names – persulfuric acid, sulfo oxy hydrogen sulfate

H2S2O8 Peroxydisulfuric Acid
pH 6
Molecular Weight/ Molar Mass 194.14 g/mol
Conjugate base‎ ‎Peroxydisulfate
Melting Point 65 °C
Chemical Formula H2S2O8

Peroxydisulfuric Acid Structure – H2S2O8

Peroxydisulfuric Acid Structure

Physical Properties of Peroxydisulfuric Acid – H2S2O8

Odour Odourless
Appearance Colourless solid
Covalently-Bonded Unit 1
Heavy Atom Count 10
Hydrogen Bond Acceptor 8
Solubility Soluble in water

Chemical Properties of Peroxydisulfuric Acid – H2S2O8

    • Peroxydisulfuric Acid dissolves in water forms hydrogen peroxide and sulphuric acid. The chemical equation is given below.

H2S2O8 + 2H2O → H2O2 + 2H2SO4

    • Peroxydisulfuric Acid reacts with silver nitrate in aqueous medium forms silver oxide, sulphuric acid and nitric acid.

H2S2O8 + 2AgNO3 + 2H2O → Ag2O2 + 2H2SO4 + 2HNO3

Uses of Peroxydisulfuric Acid – H2S2O8

  • Use of peroxydisulfuric acid and its salts as a source of hydrogen peroxide opened the way for large-scale production of sulphuric acid.
  • Used as a hypo eliminator in photography.
  • Used as a strong oxidant but the quantity of the oxidizing agent used can be varied in accordance to the desired reaction rate.
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