Pure aspirin has a melting point of 135-136°C. Before the melting point was determined - if one crystal sample contains methanol due to incomplete solvent removal, and the other crystal sample contains water by absorbing moisture in the air - what effect could these have on the observed melting points from the two samples?

EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN:9781305446021
Author:Lampman
Publisher:Lampman
Chapter84: Fractional Distillation, Azeotropes
Section: Chapter Questions
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Pure aspirin has a melting point of 135-136°C. Before the melting point was determined - if one crystal
sample contains methanol due to incomplete solvent removal, and the other crystal sample contains
water by absorbing moisture in the air - what effect could these have on the observed melting points
from the two samples?
Transcribed Image Text:Pure aspirin has a melting point of 135-136°C. Before the melting point was determined - if one crystal sample contains methanol due to incomplete solvent removal, and the other crystal sample contains water by absorbing moisture in the air - what effect could these have on the observed melting points from the two samples?
Referring to Question 2, if the dried aspirin sample is contaminated with a trace amount of 4-
Bromobenzoic acid (lit. MP 252-254 °C), what effect could this have on the observed melting point?
Transcribed Image Text:Referring to Question 2, if the dried aspirin sample is contaminated with a trace amount of 4- Bromobenzoic acid (lit. MP 252-254 °C), what effect could this have on the observed melting point?
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