Q1. Give three criteria for a good recrystallization solvent.Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 gof salicylic acid. You are given the following data:Solubility in water at 20 °C Solubility at 100 °C(g/10 ml)Compound(g/10 ml)Benzoic Acid 0.029 0.680Salicylic Acid0.6800.0290.226.67a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid?(show calculations)b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations)c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason foranswer)d) What is the maximum amount of benzoic acid that could be recovered in the firstcrop of this recrystallization? (Show calculations)e) How can you prove the purity and identity of the purified Benzoic acid?

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Q1. Give three criteria for a good recrystallization solvent.

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Question

Q1. Give three criteria for a good recrystallization solvent.
Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 g
of salicylic acid. You are given the following data:
Solubility in water at 20 °C Solubility at 100 °C
(g/10 ml)
Compound
(g/10 ml)
Benzoic Acid 0.029 0.680
Salicylic Acid
0.680
0.029
0.22
6.67
a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid?
(show calculations)
b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations)
c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason for
answer)
d) What is the maximum amount of benzoic acid that could be recovered in the first
crop of this recrystallization? (Show calculations)
e) How can you prove the purity and identity of the purified Benzoic acid?

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