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What steps are used to perform gravimetric analysis by precipitation?
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Gravimetric analysis by precipitation is a quantitative chemical analysis technique used to determine the amount of a specific constituent in a sample by converting it into an insoluble, weighable solid.12
The process typically follows these steps:
- Preparation: A known weight of the sample is dissolved in a suitable solution.1
- Precipitation: A specific reagent is added to the solution to transform the desired constituent into an insoluble compound. This reagent is chosen to react selectively with the analyte without precipitating other components.13
- Separation: The resulting precipitate is separated from the solution, typically through filtration.12
- Washing: The precipitate is washed to remove any soluble impurities.1
- Drying or Ignition: The solid is dried or ignited to remove water or other volatile components, ensuring the final product is of a known, stable composition.12
- Weighing and Computation: The isolated constituent is weighed. The final amount of the analyte in the original sample is then calculated based on the mass of the precipitate and its known chemical formula.12