you want to purify 10g of a compound A that has been contaminated with 0.20g of compound B. solubilities in water of the two compounds are given.

compound A - solubility at 20Â°c= 0.029g/mol, solubility at 100Â°c= 0.680g/mol

compound B - solubility at 20Â°c = 0.22, solubility at 100Â°c = 6.67

a) what volume of boiling water is needed to dissolve 10g of compound A?

b) How much of compound A will remain after cooling to 20Â°c?

c) what is the maximum amount of compound A that can be recovered in the first crop of this recrystallization?

d) will any compound B crystals form ( will compound B be pure)? show work to explain answer.

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dubeyshivanshu047Lv1

10 Dec 2022

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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

A process of recrystallization involves dissolving the solid inan appropriate solvent at an elevated temperature and allowing thecrystals to re-form on cooling. Residual amount of solvent isremoved by drying the crystals and therefore usually does notconsider to be an impurity, although if the crystals are not driedproperly the residual solvent will affect the melting pointmeasurements.
The choice of solvent is the most critical step in the process ofrecrystallization. Which of the following criteria should besatisfied while choosing a solvent for recrystallization?

Select one:

a. A compound to be purified should be completely soluble in areasonable amount of hot solvent.

b. A compound to be purified should be insoluble, nearlyinsoluble, or slightly soluble in cold solvent.

c. Impurities should be either insoluble in the solvent at alltemperatures so they can be filtered out or soluble in a coldsolvent staying in it while the desired compound willprecipitate.

d. The boiling point of the solvent should be low enough so theresidual amount of it will be readily removable from the crystalsof pure compound.

e. The boinling point of the solvent should generally be lowerthan the melting point of the desired compound so the compound willnot melt while heating the solvent giving the impression that ithas been dissolved.

f. The solvent should not react chemically with the compoundbeing purified.

g. All of these considerations are correct.