Chem 2315 Lab Manual (Experiment 1) 12. Which one of the below should not happen

Question

Chem 2315 Lab Manual (Experiment 1) 12. Which one of the below should not happen during the hot filtration step of a 61 recrystallization? (That is, which statement below is false?) a. The solution should pass through the filter paper before it crystallizes b. Product crystals should collect in the filter paper. soluble impurities, such as activated charcoal, should be filtered out d. The solution should stay hot until it passes through the filter paper e. Evaporation of solvent should be minimized during hot filtration. Explain What are the two common ways of avoiding product contamination by "aspirator backup" during vacuum filtration? (Mark two answers.) a. Place a "trap" in your aspirator line. b. Connect the aspirator hose directly to your filtration flask. c. Turn the water flow rate down. d. Disconnect the aspirator line from your filtration flask before turning off the 13. water. e. Use thin wall tubing in your aspirator line. 14. What are two common problems with gravity hot filtration during recrystallization? (Mark two answers.) a. It is difficult to fold the filter paper. b. It is so slow that the solution often cools before it can be filtered c. The process involves a complicated setup. d. The filter can clog due to premature crystallization. e. It is difficult to cool the filtrate fast enough

Explanation / Answer

Ans 12 : b) Product crystals should collect in the filter paper.

The solution in the process has solvent , solute and some impurities in the form of particulate matter , which can be removed by adding the activated charcoal.

The charcoal (carbon) absorbs the impurities , which can then be filtered out. The product crystals are formed as the solvent is cooled. The crystals can then be collected using vacuum filtration.

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