a) What volume of boiling solvent is needed to dissolve .65g of sulfanilamide? b
ID: 528132 • Letter: A
Question
a) What volume of boiling solvent is needed to dissolve .65g of sulfanilamide?
b) Using the amount from a) how much sulfanilamide will crystallize after cooling to 20oC?
c) After reaching room temperature, the solution in c) was cooled further in an ice-water bath to 0oC. What is the maximum amount of sulfanilamide that can be recovered in this recrystallization?
(SHOW ALL CALCULATIONS)
16 5. (6 pts) The solubility of sulfanilamide in the recrystallization solvent you used in the lab is given in the following table: Temperature (OC) Solubility mg/mL 14 24 20 46 40 60 210 78Explanation / Answer
a) If the boiling point of solvent is 78 oC
Solubility of sulfanilamide at 78 oC = 210 mg/ml
So for dissolving 650 mg of sulfanilamide we would need = 650/210 = 3.1 ml solvent
b) when cooled at 20 oC,
mass of sulfanilamide recrystallized = (650/3.1) - 24 = 185.7 mg/ml
From 3.1 ml solution = 3.1 x 185.7 = 575.7 mg
c) solubility of at 0 oC = 14 mg/ml
amount of sulfaniliamide recrystallized = 185.7 - 14 = 174.7 mg/ml
Total sulfanilamide recovered by recrystallization = 174.7 mg/ml (0.1747 g/ml)
Actual sulfanilamide recovered from 3.1 ml = 3.1 x 174.7 = 541.6 mg (0.5416 g)
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