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A type of quantitative analysis in which the amount of a species in a material is determined by converting the species to a product that can be isolated completely and weighed is "gravimetric analysis."
What is gravimetric analysis?
Gravimetric analysis is a quantitative chemical analysis method in which the contribution sought is transformed into a material (of different compositions) that can be separated and weighed from the sample.
Some key features regarding the gravimetric analysis are-
- Gravimetric analysis typically involves the following steps:
- preparation of a solution containing the known weight of sample,
- separation of a required constituent,
- weighing the isolated constituent, and
- computation of exact amount of a particular constituent with in sample from a estimated weight of a isolated substance.
- The most common method for isolating the preferred constituent from a sample solution is precipitation—that is, transition into a substance that is not soluble in the solution.
- A reagent is added, which constitutes an insoluble compound only with desired constituent but does not precipitate the sample's other constituents.
- Filtration is used to separate the precipitate, which is then washed to remove soluble impurities, dried and ignited to drain water, and weighed.
- Certain substances, such as carbonate in a mineral analysis, can be separated due to their easy conversion into gaseous compounds.
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