loss on drying we applied vaccum for some compounds and
some compounds are at 105c why
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Thermally liable compounds are dried in hot air oven.
Thermally un stable compounds are dried under vaccum.
Vaccum is applied to prevent sample loss due to
splashing,foming.Low boiling samples are dried under vaccum.
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Answer / falguni
As per
PV=NRT, if we decrease pressure, temperature also decrease.
Vacuum i.e. no pressure. If we heat our sample which has
low melting point(near 60C), it melts at 60C. Vacuum lowers
the temprature but effect on sample is in equilibrum to the
higher temperature. It does not melt the sample but remove
volatile solvents and adsorbed water.
| Is This Answer Correct ? | 7 Yes | 0 No |
Answer / virender
In a Vacuum Oven, the thermal processes occur in an airtight
chamber where a desired level of vacuum has been applied
using an external vacuum pump (not included). With a vacuum
oven the entire application can take place under vacuum or a
controlled atmosphere can be created through the
introduction of an inert gas. Vacuum ovens can help in the
prevention of surface reactions (such as oxidation),
decontaminating samples (removing lubricants for example) as
well as for speeding up the out gassing process. When
determining the process you will use for a vacuum oven bear
in mind that you will need to size a pump to meet this
application. This requires defining the appropriate chamber
size, the level of vacuum desired, and how quickly you will
need to reach that desired vacuum level.
| Is This Answer Correct ? | 2 Yes | 0 No |
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Organic Chemistry 
