Iodic acid

Iodic acid

Colorless, rhombic, piezoelectric crystals

Fixed

4.63 g · cm -3

110 ° C.

0,804

  • Very well in water
  • Insoluble in ethanol, chloroform and diethyl ether

Risk

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Iodic acid, iodic acid also is a halogen oxygen acid, such as perchloric acid and hydrobromic acid. It is the only halogen (V ) acids of the type HXO3 which can be isolated free of water.

Production

Iodic acid is obtained by oxidation of iodine with strong oxidizing agents such as nitric acid (HNO3), chloride, chloric acid or hydrogen peroxide ( H2O2):

The resulting hydrochloric acid must be removed from the balance, as it would reduce the iodic acid because of the back reaction and shift the equilibrium to the left side. This can be achieved, for example, mercury (II ) oxide ( HgO ).

Properties

According to the VSEPR model iodic acid is built pyramidal. Iodic acid is transparent, colorless, rhombic crystals that dissolve very easily in water. The substance is a medium strong acid with a pKa value of 0.804 and is highly oxidizing. Iodic acid is polymorphic. In addition to the thermodynamically stable α - form noncentrosymmetric exists a metastable γ - centrosymmetric form.

Iodate

Iodate are the salts of iodic acid of the general formula MnIO3 (M = metal, L = a function of the valency of the metal ). They are more stable than chlorates and bromate, but how these strong oxidizing agents. From iodates can release iodic acid by reaction with sulfuric acid.

Safety

Iodic acid and iodate are very strong oxidizing agent and can react explosively with reducing agents such as sulfur, metal powder or organic substances.

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