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23 Nov 2019

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

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Patrina Schowalter
Patrina SchowalterLv2
28 Oct 2019

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Related questions

A. The solubitlity of an unkown compound X in ethanol is found to be 0.21 grams per 10mL at 0*C and 1.4 grams per 10mL at 78*C. What is the minimum amount of ethanol needed to recrystallize a 2.0 gram sample of compound X? After recrystallization of the 2.0 gram sample, how much compound X will remain dissolved in the cold solvent (i.e., how much of compound X is not recovered after the recrystallization)?B. Why is it important to use only the minimal amount of hot solvent needed to achieve a recrystallization? What would be the effect using too much solvent while dissolving a solid for recrystalization?C. What do you think would happen to your recrystallization solution if you did not use a preheated filter during the "hot" gravity filtration step?D. Benzyl alcohol has a boiling point of 205*C. It has solubility characteristics that would seem to make it a good choice for use as a recrystallization solvent for fluorenol (m.p. 153-155*C), but in fact benzyl alcohol is a poor choice of solvent for this recrystallization. Why do you think this is? (Hint: you do not need any other information to answer this question.)E. Explain how each of the following contaminants is removed during the recrystallization process:1. sand (inorganic contaminant)2. colored organic contaminants3. a very soluble contaminant

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

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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