Chapter 14: Problem 1

Prepare a list of all the laboratory equipment you would require to recrystallise, from ethanol, an off-white solid \((\approx 4 \mathrm{~g}\) ) contaminated with a small amount of grit, which should have a m.pt. \(\sim 140^{\circ} \mathrm{C} .\)

Short Answer

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The equipment needed includes a hot plate, beaker, spatula, glass rod, watch glass, Buchner funnel, filter flask, filter paper, a melting point apparatus, and capillary tubes.

Step by step solution

Equipment for the Process of Recrystallization

Equipment necessary for the recrystallization involves: a) a hot plate or Bunsen burner to provide heat, b) a beaker for heating the solvent, c) a spatula or utensil for introducing the crude substance into the solvent, d) a glass rod or a magnetic stirrer for distributing heat evenly and aid the dissolution, and e) a watch glass or evaporating dish to collect the recrystallized substance.

Equipment for Filtering Out Grit

After the dissolution, the solid needs to be separated from the grit. It could be done by using a vacuum filtration system, which includes: a) a Buchner funnel, b) a filter flask, and c) filter paper.

Equipment for Testing Melting Point

At the end of the process, the melting point of the recrystallized substance will need to be tested to ensure its purity. This can be achieved by using a melting point apparatus. Additionally, a capillary tube will be required for packing the substance for the testing.

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Prepare a list of all the laboratory equipment you would require to recrystallise, from ethanol, an off-white solid \((\approx 4 \mathrm{~g}\) ) contaminated with a small amount of grit, which should have a m.pt. \(\sim 140^{\circ} \mathrm{C} .\)

Short Answer

Step by step solution

Equipment for the Process of Recrystallization

Equipment for Filtering Out Grit

Equipment for Testing Melting Point

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