Experiment 9: Gravimetric Analysis (Analysis of Chloride by gravimetery) Aim: The aim of this practical is to introduce gravimetric analysis and allow you to compare and contrast two methods of analysis. Principles: Gravimetric analysis, by definition, includes all methods of analysis in which the final stage of the analysis involves weighing. In the most basic case, this could involve simply heating a sample to dryness and weighing to determine the amount of volatile components. The quantitative determination of a substance by precipitation followed by isolation and weighing of the precipitate is called Gravimetric analysis Theodore W. Richards (1868 - 1928) and his graduate students at Harvard developed or refined many of the techniques of gravimetric analysis of silver and chlorine. These techniques were used to determine the atomic weights of 25 of the elements by preparing pure samples of the chlorides of the elements, decomposing known weights of the compounds, and determining the chloride content by gravimetric methods. From this work Richards became the first Am......

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