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
- Peroxydisulfuric Acid Structure – H2S2O8
- Physical Properties of Peroxydisulfuric Acid – H2S2O8
- Chemical Properties of Peroxydisulfuric Acid – H2S2O8
- Uses of Peroxydisulfuric Acid – H2S2O8
Peroxydisulphuric Acid Structure – H2S2O8
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
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- Peroxydisulphuric Acid dissolves in water to form hydrogen peroxide and sulphuric acid. The chemical equation is given below.
H2S2O8 + 2H2O → H2O2 + 2H2SO4
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- 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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