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26 Nov 2019

When would a hot filtration step not be necessary in a purification by recrystallization? What experimental observation of the hot solution would let you know that it was not needed?

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Nelly Stracke
Nelly StrackeLv2
22 Feb 2019

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Related questions

What would happen to a recrystallization solution if you didn'tusea preheated filter during the hot gravity filtration step?

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

1. When doing a recrystallization, what observations wouldprompt you to perform a hot filtration?
2. What problems might arise if a hot solution is filtered byvaccum filtration?
3. What is meant when aniline is referred to as the "limitingreagent" in the reaction with acetic anhydried?
4. Under what circumstances would you use mixed solvents in arecrystallization?
5. Why do you we keep the volume of the rinses small in therecrystallization procedure?

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