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Loss on drying
Max. 1.00%
-
Sulphate
Max. 0.0500%
-
Iron
Max. 0.0050%
Potassium Iodide: CAS: 7681-11-0, Molecular formula KI . Mwt. 166 gmmol is an inorganic salt of Iodine , available in white crystalline powder form. Due to its Ionic form K+ I- , and iodide ion being a mild reducing agent , it can be easily oxidized to Iodine by powerful oxidizing agent like chlorine. With elemental iodine it forms I3 ( tri iodide) , the salts of tri iodide are highly water soluble. On long exposure to air Potassium Iodide becomes yellow due to liberation of Iodine . Potassium Iodide is more readily soluble in water. The solubility in water increases with the increase in temperature ie. ( 140 gms. 100 ml @ 20 oc, 206 gms 100 ml @ 100 oc, ) . It is slightly soluble in ether, ammonia. It absorbs water less readily than Sodium Iodide and hence is convenient to use.
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