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Unknown Salt Lab Report

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An unknown salt sample was placed at the lab station and the sample number was recorded. Two uncontaminated and dry crucibles were previously taken out of a 110oC oven 20 minutes prior to the lab section by the TA, to cool. An analytical balance was used to accurately measure the mass different of a 0.1000g to 0.1500g sample of the unknown salt. The masses of the unknown salt sample number #338 was both weighed by the difference into a 200ml beaker. The mass of the sample salt obtained by the author was 0.1054g and the amount obtained by the author’s partner was 0.1104g respectively. The estimated volume of 0.1 M AgNO3 that will be needed for the precipitate volume will be calculated.To make sure that all chloride are precipitated, 5 ml of O.1 M AgNO3 was added to the calculated approximate volume to which another 1ml of dilute (6M) HNO3 and a 100 ml of distilled water were also added.…show more content…
Stirring the mixture gently till is almost at boiling point; drops of silver nitrated were added to check if the mixture was entirely precipitated. After through precipitation, the mixture was placed in drawer to cool down. In the meantime, the sinister glass crucible was weighed on the balance. After the mixture put in the drawer has cooled, the vacuum filtration apparatus was put together and the supernatant liquid was poured into the glass filter leaving the precipitate in the beaker. This process was done again when more amount of 0.01M HNO3 was added to thoroughly filter and transfer the precipitate in the crucible. The flask was cleaned after detaching from the crucible and then reconnected to the crucible to be filtered out one more time with 0.01M HNO3. This time, the aliquot of HNO3 was put in a test tube and given to the TA to test for no turbidity. After the TA’s approval, the apparatus was reconnected and three 5ml portions of acetone washed the
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