|Nov23-11, 06:11 PM||#1|
Maximum Percent Recovery
1. The problem statement, all variables and given/known data
Solubility of acetanilide in water is
5.5g/100mL at 100C
0.53g/100mL at 0C
A 0.150g sample of acetanilide containing only traces of impurities was recrystalized using a total of 3mL of hot water.
a) What is the maximum possible percent recovery of pure acetanilide? Show all steps...
b) By how much would the % recovery be reduced if, during vacuum filtration, the crystals were washed with a total of 20mL of ice cold water?
2. Relevant equations
Percent recovery equation and basic mathematical operations...
3. The attempt at a solution
for a) :=
mass that was recrystallized is 0.150g (is this correct assumption?)
maximum acetanilide that could dissolve in water at 100C is 0.165g (100mL = 5.5g then how much is 3mL...)
which implies that max recovery is (0.15/0.165)*100% = 90.9%
Is this right??!
for b) :=
amount that could dissolve in 20mL cold water= 20*0.53/100 = 0.106g
which implies that amount recovered = 0.150-0.106g = 0.044g
which implies that percent recovery is 0.044/0.165*100 = 26.7%
which means that % recovery will be reduced by 64.2%
Am I correct? Thanks :)
|Nov23-11, 07:46 PM||#2|
|Nov23-11, 08:36 PM||#3|
if I lose 0.0159 then my max percent recovery is [(0.150-0.0159)/0.150]*100=89.4%
|acetanilide, chemistry, maximum, percent, recovery|
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