Question

Question about Experiment of recrystallization of a solid

1. Explain the purpose of the following in this experiment:

a. using hot filtration

b. not cooling (chilling) the hot filtered solution immediately

c. washing the crystals in the final step with ice cold water

d. using gravity filtration (not vacuum filtration) in the hot filtration step

e. using a stemless funnel in the hot filtration step

2. What are the requirements for a good recrystallizing solvent?

3. Using the data of Table 6.1, compare the following pair of liquids as recrystallization solvents:

a. water vs. acetone

b. methanol vs. toluene

c. benzene vs. cyclohexane

d. chloroform vs. ethyl acetate