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Gravimetric Analysis report

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Gravimetric Analysis report
SynopsisThe objective is to determine the amount of Sulphate in anhydrous Barium Sulphate precipitate by gravimetric method. Gravimetric method is by the quantitative determination of the mass of anhydrous Barium Sulphate precipitate. Barium sulphate precipitate is form when Barium Chloride is added excessively to a hot given Sulphate solution slightly acidified with concentrated Hydrochloride acid. The white precipitate of hydrate Barium Sulphate formed is than digest, filtered out, washed and dried than cool down in a desiccator. Anhydrous Barium Sulphate is formed and weight using analytical balance. We will find that the mass of Barium Sulphate precipitate form is 0.1990g and with the knowledge of its chemical composition, we can calculate the amount of Sulphate. From these, we found that amount of Sulphate is 0.0820g. And the major experimental finding is that gravimetric analysis is one of the most accurate and precise methods of macro-quantitative analysis as we can calculate till high figure accuracy.

ObjectiveThe purpose of this experiment by gravimetric method is to determine the amount of Sulphate in a solution. In addition, to learn to carry out vacuum filtration of Barium Sulphate precipitate and use a desiccator correctly.

TheoryThe amount of Sulphate is determined quantitatively from Barium Sulphate by gravimetric method.

This determination consists of slowly adding, with vigorous stirring a dilute solution of barium chloride to a hot solution of the Sodium Sulphate which is slightly acidified with concentrated hydrochloride acid for the removal of impurities and preventing carbon dioxide in the air from reacting to barium to form barium carbonate precipitate. Dilute and hot solutions with slowly adding and effective stirring are done to decrease the degree of contamination of impurities.

Barium Sulphate precipitate form is allowed to digest which can help to reduce the amount of co precipitation. Co precipitation may result in excess mass hence,


References: .http://chemistry.olivet.edu/classes/chem301/pdf/Gravimetric%20Precipitation.PDF2.http://en.wikipedia.org/wiki/Gravimetric_analysis3.http://kinardf.people.cofc.edu/154L_HONS_HonorsChemistryLaboratory/154_Exp5_GravimetricSulfateAnalysis.pdf4.Analytical Chemistry(5th edition) Gary D. Christian5.http://www.sciencetechnologyaction.com/lessons2.php?studyid=26
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