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Gravimetry is the quantitative measurement of an analyte by weighing a pure, solid form of the analyte. Obtaining pure solids from solutions containing an unknown amount of a metal ion is done by precipitation.
Since gravimetric analysis is an absolute measurement, it is a principal method for analyzing and preparing primary standards. A typical experimental procedure to determine an unknown concentration of an analyte in solution is as follows: quantitatively precipitate the analyte from solutioncollect the precipitate by filtering and wash it to remove impuritiesdry the solid in an oven to remove solventweigh the solid on an analytical balancecalculate the analyte concentration in the original solution based on the weight of the precipitate Examples of Gravimetric Lab ProceduresGravimetric Determination of IronDetermine constant weight of the cruciblesOxidation of iron samplePrecipitation of iron hydroxideIgnition of iron hydroxide to iron oxideDetermine constant weight of the crucibles plus iron oxideCalculation of iron in the sample
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