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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???? |
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There is no answer at this time. |
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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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