Abstract
Photometric titration of potassium iodide at 290mμ was found to give different equivalence according to the acid added.1) When titrated with potassium permanganate, 2cc. of 0.001M KI corresponds to 1cc. of 0.002M KMnO4 in sulfuric, phosphoric, and acetic acidity, while a breaking point is present at the point of 1cc. 0.001M KI≡1cc. 0.002N KMnO4 in hydrochloric acidity.2) When titrated with potassium iodate, the breaking point is present at the point of 5cc. 0.001M KI≡1cc. 0.001M KIO3 in sulfuric and phosphoric acidity, and at the point of 0.001M KI≡1cc. 0.001M KIO3 in hydrochloric acidity.However, the determined values comes out lower when titration is carried out in hydrochloric acidity. It is therefore considered to be the most suitable to carry out titration with potassium permanganate in sulfuric acidity in determination of potassium iodide in the presence of chloride, bromide, and iodide ions, and with potassium iodate in sulfuric acidity when determining potassium iodide in the presence of chlorine and bromine ions, iodine, and Ethanol
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