Potassium iodate KIO

Note-. Potassium iodide (Ki) potassium iodate (KiOs) sodium iodide (Nai) recommended dietary allowance (RDA) recommended daily intake (RDi) parts per miiiion (ppm). 

Thirty isotopes are recognized. Only one stable isotope, 1271 is found in nature. The artificial radioisotope 1311, with a half-life of 8 days, has been used in treating the thyroid gland. The most common compounds are the iodides of sodium and potassium (KI) and the iodates (KIOs). Lack of iodine is the cause of goiter. 

Simple ABO compounds in addition to BaTiO are cadmium titanate [12014-14-17, CdTiO lead titanate [12060-00-3] PbTiO potassium niobate [12030-85-2] KNbO sodium niobate [12034-09-2], NaNbO silver niobate [12309-96-5], AgNbO potassium iodate [7758-05-6], KIO bismuth ferrate [12010-42-3], BiFeO sodium tantalate, NaTaO and lead zirconate [12060-01 -4], PbZrO. The perovskite stmcture is also tolerant of a very wide range of multiple cation substitution on both A and B sites. Thus many more complex compounds have been found (16,17), eg, (K 2 i/2) 3 ... 

Potassium iodate [7758-05-6] KIO, mol wt 214.02, 59.30% I, forms white, odorless crystals or a crystalline powder. It has a density 3.98 g/mL and mp of 560°C with partial decomposition. Potassium iodate is rapidly formed when potassium iodide is fused with potassium chlorate, bromate, or perchlorate. The solubihty in water is 9.16 g/100 g H2O at 25°C and 32.2 g/100 g H2O at 100°C. KIO is extensively used as an oxidizing agent in analytical chemistry and as amaturing agent and dough conditioner (see Bakery processes and leavening agents). 

Approximately 80 wt % of the potassium iodate [7758-05-6] KIO, crystallizes from the reaction mixture and is separated for sale. Of the remainder, 90 wt % is removed by evaporation, fusion, and heating to ca 600°C. 

The determination of tin in metals containing over 75 wt % tin (eg, ingot tin) requites a special procedure (17). A 5-g sample is dissolved in hydrochloric acid, reduced with nickel, and cooled in CO2. A calculated weight of pure potassium iodate (dried at 100°C) and an excess of potassium iodide (1 3) are dissolved in water and added to the reduced solution to oxidize 96—98 wt % of the stannous chloride present. The reaction is completed by titration with 0.1 Af KIO —KI solution to a blue color using starch as the indicator. 

If potassium iodate is heated, there is no release of oxygen KIO,->... 

Analysis of Metals (1) proposes the combustion method combined with iodo-metric titration for the determination of sulphur concentrations above 50 Mg/g. The sample weight is 1 g. The combustion is carried out in a tube furnace at 1250 to 1300°C, using oxygen. The combustion gases are absorbed in 100 ml hydrochloric acid (3+200). The titration is performed using a potassium iodate-iodide solution (0.2225 g KIO /l) and starch as indicator, whereby in the course of the combustion so much iodate solution has to be continuously added that the light blue colour of the solution does not vanish. When the combustion is running lower it has to be titrated slowly. 

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