2092. Chloric Acid

Nomenclature

CAS number: 7790-93-4
ClHO3; mol wt 84.46.
Cl 41.98%, H 1.19%, O 56.83%.
HClO3.

Description and references

Prepd from barium chlorate and sulfuric acid: Lamb et al., J. Am. Chem. Soc. 42, 1643 (1920); from sodium chlorate using ion-exchange resins: Klement, Z. Anorg. Allg. Chem. 260, 271 (1949).

Properties

Known in aq soln only. Aq solns are stable if pure and protected from light. Oxidizer. 1% aq soln d418 1.0044; 6% soln d418 1.0344; 10% soln d418 1.0594; 16% soln d418 1.0991; 20% soln d418 1.1273; 24% soln d418 1.1568. A 40% soln corresponds to HClO3.7H2O, d420 1.282. If higher concns are attempted by evaporation the soln begins to dec with evolution of chlorine and oxygen and formation of perchloric acid.

Caution

Strongly irritating to skin, mucous membranes.

Use

Oxidizing agent; with H2SO3 as catalyst in acrylonitrile polymerization.