3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||84.45914 g mol−1|
|Density||1 g/mL, solution (approximate)|
|>40 g/100 ml (20 °C)|
|Acidity (pKa)||~ −1|
|Occupational safety and health (OHS/OSH):|
|P210, P220, P221, P260, P264, P280, P283, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P306+P360, P310, P321, P363, P370+P378, P371+P380+P375, P405, P501|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Chloric acid, HClO3, is an oxoacid of chlorine, and the formal precursor of chlorate salts. It is a strong acid (pKa ≈ −2.7) 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:
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:
Another method is the heating of hypochlorous acid, producing chloric acid and hydrogen chloride: