Gravimetric analysis is a method in analytical chemistry used for the quantitative determination of an analyte (the ion being analyzed) based on its mass. Gravimetric analyses depend on comparing the masses of two compounds containing the analyte. The principle behind gravimetric analysis is that the mass of an ion in a pure compound can be determined and then used to find the mass percent of the same ion in a known quantity of an impure compound.
The four main types of this method of analysis are precipitation, volatilization, electro-analytical and miscellaneous physical method. The methods involve changing the phase of the analyte to separate it in its pure form from the original mixture and are quantitative measurements.
Steps followed in the Gravimetric Analysis
- Preparation of a solution containing a known weight of the sample.
- Separation of the desired constituent.
- Weighing the isolated constituent.
- Computation of the amount of the particular constituent in the sample from the observed weight of the isolated substance.
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