... for the standardization of a thiosulphate solution are potassium bromate and metallic copper. The former is obtainable in pure condition or may be easily purified by re-crystallization. Copper wire of high grade is sufficiently pure to serve as a standard. Both potassium bromate and cupric salts in solution will liberate iodine ... — An Introductory Course of Quantitative Chemical Analysis - With Explanatory Notes • Henry P. Talbot
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