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11 Nov 2019
Each of the following procedural errors is likely to cause either the problem of low yield of crystals, the problem of low purity of crystals, or both. Which one of these problems would be most likely to occur for each error listed. Explain why. (a) Too much solvent was added when the sample was dissolved. (b) Too little solvent was added when the sample was dissolved and the solution was allowed to crystallize without filtering. (c) The hot solution was cooled quickly in ice water to hasten crystallization, rather than being allowed to cool slowly to room temperature before placing in ice. (d) The washing of crystals on the Buchner funnel was done with room-temperature solvent rather than with ice-cold solvent. Assuming that the compound isolated by crystallization from water in this experiment will be one of the simulated Bromoseltzer components, predict, as best as you can, which component it will be. You need not be positive about your answer - that's what experiments are for. Indicate the factors involved in your decision and how you arrived at your prediction (you will need to have the Table of Reagents section in your lab notebook complete to do this). Use the back of this paper if you run out of room.
Each of the following procedural errors is likely to cause either the problem of low yield of crystals, the problem of low purity of crystals, or both. Which one of these problems would be most likely to occur for each error listed. Explain why. (a) Too much solvent was added when the sample was dissolved. (b) Too little solvent was added when the sample was dissolved and the solution was allowed to crystallize without filtering. (c) The hot solution was cooled quickly in ice water to hasten crystallization, rather than being allowed to cool slowly to room temperature before placing in ice. (d) The washing of crystals on the Buchner funnel was done with room-temperature solvent rather than with ice-cold solvent. Assuming that the compound isolated by crystallization from water in this experiment will be one of the simulated Bromoseltzer components, predict, as best as you can, which component it will be. You need not be positive about your answer - that's what experiments are for. Indicate the factors involved in your decision and how you arrived at your prediction (you will need to have the Table of Reagents section in your lab notebook complete to do this). Use the back of this paper if you run out of room.
Lelia LubowitzLv2
8 Apr 2019