Peroxymonosulfuric acid

• Peroxosulfuric
• Sulfomonopersäure
• Peroxy - sulfuric acid mono
• Caro's acid

Colorless solid

Fixed

Decomposition above 45 ° C

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Peroxomonosulfuric (also peroxosulfuric, peroxy mono sulfuric acid or Caro's acid ) is an oxoacid of sulfur. Its salts are called peroxymonosulfates, eg potassium peroxomonosulfate ( K2SO5 ). The colorless aqueous solutions of peroxomonosulfuric are colloquially known as Knabberwasser, piranha acid or piranha solution.

Representation

A synthesis can be carried out by reacting chlorosulfonic acid ( ClSO3H ) with hydrogen peroxide:

Upon further reaction with chlorosulfonic acid to peroxodisulfuric forms.

Peroxomonosulfuric as an aqueous solution is unstable even under normal conditions and is therefore always re-established for use. For this purpose, concentrated to a 30 % hydrogen peroxide solution of sulfuric acid in a volume ratio of 1:1, in part, 1:2, added ( caution: heat).

Properties

Peroxomonosulfuric is a colorless, very hygroscopic, finely crystalline solid that smells like ozone. In its pure state it is several weeks under the little loss of active oxygen preserved, in impure form it is much more volatile. It is soluble in alcohol without decomposing and slightly soluble in ether. When dissolved in water (H2O2) is released in an equilibrium reaction of hydrogen peroxide:

Peroxomonosulfuric has strong oxidizing and is used as a cleaning and bleaching agent. The chemist Heinrich Caro it represented the first time and described it in 1898.

Use

Peroxomonosulfuric is used by chemists occasionally for cleaning glass frits etc.. Here, under no circumstances should organic solvent such as Acetone are added, as this can lead to serious explosions.