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Copyright © Tarek Kakhia. All rights reserved. http://tarek.kakhia.org Chloric 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 . It is prepared by the reaction of sulfuric acid with barium chlorate, the insoluble barium sulfate being removed by precipitation : Ba ( ClO3 ) 2 + H2SO4 → 2H ClO3 + Ba SO4 Another method is the heating of hypo chlorous acid, of which productions include chloric acid and hydrogen chloride: 3H ClO → H ClO3 + 2 H Cl It 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, and on warming, chloric acid solutions decompose to give a variety of products, for example : 8 H ClO3 → 4 H ClO4 + 2H2O + 2 Cl2 + 3 O2 3 H ClO3 → H ClO4 + H2O + 2 ClO2 The decomposition is controlled by kinetic factors: indeed, chloric acid is never thermo dynamically stable with respect to disproportionation . Other Names Chloric (V) acid Molecular Formula Molar Mass H ClO3 84.5 g mol−1 Appearance Colourless solution Density 1 g / mL , solution Solubility in Water > 40 g / 100 ml ( 20 °C ) Acidity ( pKa ) ca. −1 Main hazards Oxidant 21PDF Image | Chlorine Characteristics
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