Brass analysis

Brass analysis

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Brass analysis. Image 6 of 7. Performing a titration to determine the percentage of copper in brass. This requires titration of iodine with sodium thiosulphate as the reagent. When the mixture containing the iodine turns pale, starch indicator is added to give a purple colour. When that solution is pale pink the titration is stopped. More starch solution is added and if there is no further colour change then the reaction is over. The stages in this experiment are shown in images A500/566-A500/572.

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Keywords: analysing, burette, chemical, chemistry, copper (i) iodide, inorganic chemistry, laboratory, precipitate, solution, starch, titrating, titration

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