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for melting point determination what is the optimum rate of ...

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Question by ben
Submitted on 6/20/2004
Related FAQ: Sci.chem FAQ - Part 1 of 7
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for melting point determination what is the optimum rate of  heating near the melting point? what are the problems , if any the rate of heating is too slow or too fast?


Answer by Kandasamy N R
Submitted on 2/24/2005
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The ramping rate affects the melting point range record and must always be
specified for full compliance with GLP specifications.

Melt point range of phenacetin at various ramp rates (OptiMelt system).
.
Ramp Rate]  Onset Point        Temp. Range
, r[C/min   - Clear Point[C]
[C]
0.1        133.7-134.2       0.5
0.2       133.8-134.4       0.6
0.5       134.0-134.9       0.9
1       134.1-135.4        1.3
2       134.3-136.2       1.9
5       134.9-137.9        3.0

Notice the larger effect of ramping rate on the clear point than on the onset point.

 

Answer by kkXqKFcVBj
Submitted on 2/18/2006
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BYYZAahuNX PzFIQ265GN 3WvkcSPCzbJ0

 

Answer by lance
Submitted on 7/2/2007
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control the heating bunsen flame

 

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