Girish Mahajan (Editor)

Chloric acid

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Formula  HClO3
Molar mass  84.45914 g/mol
Appearance  colourless solution
IUPAC ID  Chloric acid
Density  1 g/cm³
Chloric acid 3bpblogspotcomkmwQ8fO7evUTxCNmNbpPwIAAAAAAA

Related compounds  hydrochloric acidhypochlorous acidchlorous acidperchloric acid
Thermodynamicdata  Phase behavioursolid–liquid–gas
Similar  Chlorous acid, Perchloric acid, Nitric acid

Chloric acid, HClO3, is an oxoacid of chlorine, and the formal precursor of chlorate salts. It is a strong acid (pKa ≈ −1) and oxidizing agent.



Chloric acid is thermodynamically unstable with respect to disproportionation.

Chloric acid is stable in cold aqueous solution up to a concentration of approximately 30%, and solution of up to 40% can be prepared by careful evaporation under reduced pressure. Above these concentrations, chloric acid solutions decompose to give a variety of products, for example:

8HClO3 → 4HClO4 + 2H2O + 2Cl2 + 3 O23HClO3 → HClO4 + H2O + 2 ClO2


Chloric acid is a powerful oxidizing agent. Most organics and flammables will deflagrate on contact.


It can be prepared by the reaction of sulfuric acid with barium Chlorate, the insoluble barium sulfate being removed by precipitation:

Ba(ClO3)2 + H2SO4 → 2HClO3 + BaSO4

Another method is the heating of hypochlorous acid, producing chloric acid and hydrogen chloride:

3HClO → HClO3 + 2 HCl


Chloric acid Wikipedia