H2S2O8 - Peroxydisulfuric Acid

What is Peroxydisulphuric Acid?

Peroxydisulphuric Acid is a colourless solid and one of the most powerful peroxyacid oxidants available. Peroxydisulphuric Acid is an inorganic compound with the chemical formula H2S2O8. It can be generated from potassium or ammonium persulphate in an acidic solution. Also called Marshall’s acid, peroxydisulphuric acid can be produced by electrolyzing an aqueous solution containing sulphate ions in an electrolysis reactor should be produced by electrolyzing.

Other names – persulphuric acid, sulphoxy hydrogen sulphate

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

Table of Contents

Peroxydisulphuric Acid Structure – H2S2O8

Peroxydisulfuric Acid Structure

Physical Properties of Peroxydisulphuric 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 Peroxydisulphuric Acid – H2S2O8

    • Peroxydisulphuric Acid dissolves in water to form hydrogen peroxide and sulphuric acid. The chemical equation is given below.

H2S2O8 + 2H2O → H2O2 + 2H2SO4

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

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

Uses of Peroxydisulphuric Acid – H2S2O8

  • Use of peroxydisulphuric 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 oxidising agent used can be varied in accordance with the desired reaction rate.
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