Quantitative Determination Of Sulphate By Gravimetric Analysis

1614 words - 6 pages

Analytical & Physical Chemistry ( CP4001)Experiment 4:Quantitative Determination of Sulphate by Gravimetric AnalysisFormal ReportName: Chia Kok SiongAdmin no: 1027325Class: DFST/FT/2B/21SynopsisThe objective of this experiment is to determine the amount of sulphate by gravimetric analysis. The amount of sulphate is determined quantitatively as barium sulphate, BaSO4, by gravimetric analysis. For the experiment, a dilute solution of barium chloride was slowly added to a hot unknown sulphate solution slightly acidified with concentrated HCl. The precipitate is then filtered off by suction filtration, washed with water and dried in the oven at 150 degree Celsius for about half an hour and cooled in the desiccator, and weighed as barium sulphate and the percentage of sulphate was calculated from the weight of barium sulphate. The Molarity of sulphate= 0.004269 M and the concentration of sulphate in g/L= 0.4098g/L. The weight of barium sulphate was calculated to be 0.0249g. There were also no hiccups during the experiment.(133 words)ObjectiveTo determine the amount of sulphate by gravimetric analysis.Students can also be familiar to the ways to carry out Gravimetric Analysis through this experiment.TheoryGravimetric analysis has become one of the most accurate classes of analytical methods available. Commonly, gravimetric analysis is being carried out by the following steps: (1) preparing a solution containing a known weight, (2) isolation of the desired elements, (3) weighing the separated elements and (4) computation of the amount of constituent in the sample from the observed weight of the isolated substance. Precipitation and filtration are the most commonly used methods to isolate the desired substances from a solution. The reagents used in the reactions will form an insoluble compound with the desired constituents but not precipitate of other elements.Firstly, exactly 25mL of given sulphate solution was used so that it would be a fair experiment in relation to how much sulphate will be obtained at the end of the experiment with regards to the amount of sulphate solution used.Secondly, concentrated HCL was added to water in the fume hood. This is because water should not be added to concentrated acid as the heat of the solution will cause water to boil and the acid to splatter. Also, the process is done in the fume hood as concentrated HCL gives out vapour that is toxic and it should not be inhaled.Thirdly, the beaker was covered with a watch glass while heat and the use of the watch glass is to let condensation occur to prevent the lost of solution through evaporation. After that, a few drops of barium chloride was added to see if everything has mixed together. If the few drops of barium chloride added do not dissolve in the clear solution, it means that there is complete precipitation.Next, the filtration of barium sulphate precipitate is done by the use of suction filtration. For this process, the use of a filter flask is that it can...

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