I\'m taking organic chemistry 1: the experiment is Preparation and Recrystalliza
ID: 847963 • Letter: I
Question
I'm taking organic chemistry 1: the experiment is Preparation and Recrystallization of Acetanilide For my experiment the sample name is Aniline I am writing a lab report and I have no idea how to explain this to summarize the results. The Date on the impure sample:
Mass of aniline + test tube + beaker is 253.88 grams
Mass of aniline +test tube is 31.53 grams
Mass of aniline is 0.29 gram
Mole of aniline is 0.00311 mol
Theoretical moles of Acetanilide is 0.00311 mol
Theoretical mass of acetanilide 0.42038 grams
Date for recrystallized acetanilide
Mass of recrystallized acetanilide + Weighing paper is 0.65 grams
Mass of recrystallized acetanilide is 0.42 grams
Calculation of percentage recovery is 99.909%
Melting point of recrystallized acetanilide 95-99 degree Celsius
If you took a melting point of a compound you synthesized, what is the true, or literature melting point? How well does your melting point compare? What does your melting point indicate about the purity of your compound? Assume base on the read that is not clear with the experiment,
Explanation / Answer
The true or literature melting point has to noted from an external source like internet or any textbook.
The true melting point of acetanilide = 114.3 °C
There is a significant difference between 95 - 99 °C and 114.3 °C. Hence the melting point comparision has error.
% Error = [(True Value - Calculated value) / True value] x 100
% error = [(114.3 °C - 99 °C) / 114.3 °C] x 100
% error = 13.4 %
If the experimental melting point (95 - 99°C) is less than the true melting point (114.3°C) then it indicates presence of impurity because impurities decrease the melting point of the sovent.