Make an schematic diagram for procedure below: B. %SO3 determination Transfer all precipitate to the filter paper avoiding any loses during the filtration procedure. One may use a rubber policeman to scrape remaining precipitate in the beaker. Wash the precipitate in the beaker 3x with hot water before transferring to the filter paper. Test the washings with 0.1 M AgNO3 Cloudiness indicates presence of chloride ions; therefore there is a need to wash more the precipitate. Carefully lift the paper out of the funnel, fold it as demonstrated by your instructor and transfer it onto the constant weighed crucible. Dry the crucible cautiously with a small flam, as instructed by your instructor. The flame should be directed at the top of the container, and the lid should be off. Avoid spattering. After drying, char the filter paper by increasing the flame temperature. The crucible should have free access to air. The lid should be kept handy to smother the filter paper in case it catches fire. Any soot left in the crucible and the lid should be removed by directing these to the flame. Use tongs to manipulate crucible. Finally, ignite the product for 5 minutes with the full heat of the burner. Cool the crucible, briefly in air and then in a desiccator for 30 min. Weight the crucible, re-ignite, and bring to constant weight (± 0.3 mg) with repeated heating. Calculate the % SO3 in the sample, the average, SD, and % RSD.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter2: Crystallization

Section: Chapter Questions

Problem 3Q

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Make an schematic diagram for procedure below:

B. %SO₃ determination

Transfer all precipitate to the filter paper avoiding any loses during the filtration procedure. One may use a rubber policeman to scrape remaining precipitate in the beaker. Wash the precipitate in the beaker 3x with hot water before transferring to the filter paper. Test the washings with 0.1 M AgNO₃ Cloudiness indicates presence of chloride ions; therefore there is a need to wash more the precipitate. Carefully lift the paper out of the funnel, fold it as demonstrated by your instructor and transfer it onto the constant weighed crucible.
Dry the crucible cautiously with a small flam, as instructed by your instructor. The flame should be directed at the top of the container, and the lid should be off. Avoid spattering. After drying, char the filter paper by increasing the flame temperature. The crucible should have free access to air. The lid should be kept handy to smother the filter paper in case it catches fire. Any soot left in the crucible and the lid should be removed by directing these to the flame. Use tongs to manipulate crucible. Finally, ignite the product for 5 minutes with the full heat of the burner.
Cool the crucible, briefly in air and then in a desiccator for 30 min. Weight the crucible, re-ignite, and bring to constant weight (± 0.3 mg) with repeated heating.
Calculate the % SO₃ in the sample, the average, SD, and % RSD.

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