
#1
Nov2311, 06:11 PM

P: 25

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 = 0.1500.106g = 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 :) 



#2
Nov2311, 07:46 PM

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#3
Nov2311, 08:36 PM

P: 25

if I lose 0.0159 then my max percent recovery is [(0.1500.0159)/0.150]*100=89.4% Yes? 


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