Potassium
Peroxymonosulfate (chemical formula: KHSO5), commonly known as M-pyro, is an
oxidizing agent that finds wide use in industries like water treatment,
textiles, and pulp and paper. In this article, we will explore the properties
and applications of this potent yet stable compound.
Chemical Structure and Properties
M-peroxygen is a white crystalline solid that is odorless and has a slightly
salty taste. It has a molecular weight of 168.19 g/mol. The compound consists
of a potassium cation (K+) and a peroxymonosulfate anion (HSO5-).
The peroxymonosulfate anion is very unstable and readily decomposes to form
reactive oxygen species like sulfate radicals (SO4-.), hydroxide radicals
(HO.), and oxygen (O2). This decomposition occurs via both thermal and
photochemical pathways. The potassium cation acts to stabilize the anion to
some extent by ionic bonding, improving the chemical's shelf life.
Still, M-peroxygen decomposes slowly over time even at room temperature. It is
therefore usually stored in a cool, dry place away from light and heat sources
that can accelerate its breakdown. Commercially available M-pyro products
typically have a minimum shelf life of 12 months when properly stored.
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