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Q: Identifying compds per melting point ( No Answer,   1 Comment )
Question  
Subject: Identifying compds per melting point
Category: Science > Chemistry
Asked by: shadowrider-ga
List Price: $2.00
Posted: 02 Feb 2004 06:28 PST
Expires: 15 Feb 2004 13:31 PST
Question ID: 302734
If you are given an unknown that has an observed melting point of
56-60 Celcius, is it compound A (with a known mp = 55-57) or compound
B (with a known mp = 59-62)? How do you know????
Answer  
There is no answer at this time.

Comments  
Subject: Re: Identifying compds per melting point
From: stantheman-ga on 07 Feb 2004 20:07 PST
 
If you are given an unknown that has an observed melting point of
56-60 Celcius, is it compound A (with a known mp = 55-57) or compound
B (with a known mp = 59-62)? How do you know????
Compound C is the correct answer. 

The more pure a substance becomes, the narrower the melting point
range and the higher the melting point. Your unknown has a fairly wide
melting point range so it must be impure. Compound A has a narrower
range so it must be more pure than the unknown, but it has a lower
melting point which doesn't make sense if it is the same substance.
Compound C has a slightly narrower range than the unknown and a
slightly higher melting point, which is consistant with Compound C
being a slightly purer version of the unknown, so C is the only answer
that makes sense.

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