Acid Hydrochloric Iodic

It hydrolizes in water, decomposing to iodine, hydrochloric acid and iodic acid 5IC1 + 3H2O 2I2 + 5HC1 + HIO3... 

However, in strong hydrochloric acid, these reagents, as weU as iodic acid, oxidize iodine to iodine monochloride or to the ICl ion. 

C. HIO is prepared by oxidation of iodine with perchloric acid, nitric acid, or hydrogen peroxide or oxidation of iodine in aqueous suspension to iodic acid by silver nitrate. Iodic acid is also formed by anodic oxidation at a platinum electrode of iodine dissolved in hydrochloric acid (113,114). 

Iodine monochloride [7790-99-0] ICl, mol wt 162.38, 78.16% I, is a black crystalline soHd or a reddish brown Hquid. SoHd ICl exists ia two crystalline modifications the a-form, as stable mby-red needles, d = 3.86 g/mL and mp 27.3°C and as metastable brownish red platelets, d = 3.66 g/mL, mp 13.9°C and bp 100°C (dec). Iodine monochloride is used as a halogenation catalyst and as an analytical reagent (Wij s solution) to determine iodine values of fats and oils (see Fats and fatty oils). ICl is prepared by direct reaction of iodine and Hquid chlorine. Aqueous solutions ate obtained by treating a suspension of iodine ia moderately strong hydrochloric acid with chlorine gas or iodic acid (118,119). 

Preparation ofpure potassium hydrogeniodate. Dissolve 27 g of potassium iodate in 125 mL of boiling water, and add a solution of 22 g of iodic acid in 45 mL of warm water acidified with six drops of concentrated hydrochloric acid. Potassium hydrogeniodate separates on cooling. Filter on a sintered-glass funnel, and wash with cold water. Recrystallise three times from hot water use 3 parts of water for 1 part of the salt and stir continuously during each cooling. Dry the crystals at 100 °C for several hours. The purity exceeds 99.95 per cent. 

Reaction with iodic acid and hydrochloric acid produces iodine monochloride ... 

Alternatively, iodine monochloride may be made by oxidation of iodine with iodic acid in strong hydrochloric acid solution ... 

The decomposition of hydrochloric acid by electrolysis has been considered. A. Bartoli and G. Papasogli4 have investigated the electrolysis of hydrobromic acid and A. Riche that of hydriodic acid—some bromic and iodic acid are respectively formed during the electrolysis. 

A. J. Balard showed that bromic acid is decomposed by hydrobtomic add into bromine and water by hydrochloric acid into water an d bromine chloride and by hydriodic acid into water and iodine bromide. There are nine reactions belonging to this set, namely, chloric, bromic, and iodic acids each with each of the three haloid acids—HC1, HBr, and HI. The kinetics of these reactions have been studied extensively.29 W. Bray has shown that the velocity of the reaction between... 

According to H. Kammerer,31 chlorine and bromine have no action on iodic acid. E. Soubeiran found that iodic acid with hydrochloric acid produced water, iodine chloride, and chlorine and J. L. Gay Lussac found that with hydriodic acid, it produced water and iodine and with the iodides of the metals which form feeble basic oxides, iodic acid produces the metal oxide and iodine Zn(I03)2 -f 5ZnI2=6ZnO-f 6I2. According to C. F. Roberts, iodine or potassium iodide and... 

The determination of organic thiols, including dimercaptothia-diazole, by oxidation with 0.1 A iodic acid in the presence of hydrochloric acid, has been described.238... 

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