If its boiling point is 162, how is it possible for triflic acid to develop vapor at room temperature to become volatile? Please specify the answer clearly.
remember, it will have a vapour pressure which will depend on pressure and temperature decreae the former and increase the latter and you approach a boiling point.
Dear Nagradeep,
On the molecular scale I think it is explained by the Maxwell Boltzman distribution curves (or whatever variation applies to liquids or solids).
Some molecules have enough kinetic energy to burst through the liquid surface (or solid surface (sublimation)) and enter the atmosphere.
Thus even liquids with high boiling points, and even solids, can have a vapour even at room temperature.
Heat and a high flow of gas over the surface increases the rate of evaporation, and this is why even some very involatile molecules (such as RDX and HMX) can be analysed by capillary column GC.
Reagards,
Dr John
Dear Nagradeep,
The term Volatile is comparative terminology, broadly we can divide in to
high volatile, volatile, semi volatile and non volatile.
The volatility can be predicted only based on comparitive way. for e.g
Diethyl Ether 34.6, Ethyl Ether 34.6, Pentane 36.1 are volatile and at the same time
Xylene 140.0, Dimethyl Formamide 153.0, Dimethyl Sulfoxide 189.0 are also volatile.
What is volatile
Volatile
In chemistry:
Volatility (chemistry), a measure of the tendency of a substance to vaporize. It has also been defined as a measure of how readily a substance vaporizes
In computer science:
Volatile variables, variables that can be changed by an external process
Volatile memory, memory that lasts only while the power is on (and thus would be lost after a restart)
In economics:
Volatility (finance), a measure of the risk in a financial instrument
In geology:
Volatiles, the volatile compounds of magma (mostly water vapor) that affect the appearance and strength of volcanoes
In the mathematical theory of probability:
Stochastic volatility
In politics:
Pedersen index, a measure of electoral volatility in political party systems
In other uses:
Volatile Games, a video games maker
so i am saying triflic acid is volatile even though its boiling point is 162 deg C.
Regards
Selvan
Guys,
I remember stripping off (Rotovap) DMF and DMSO from reaction mixtures like they were low boiling liquids using a good vacuum and boiling water bath!
Regards,
Dr John
We had this rule: water pump vacuum lowers the boiling point by 100 deg C and mechanical pump vacuum by 150 deg C.
Regards,
Dr John
Great.......... B.Point of liquid is appear when vapour pressure of liquid = atmospheric pressure.
AND if u want to decrease the boiling temp. of liquid u will have to attach vaccume pressure externally. so that B.p will get decreases..............
some comp. decompose at there B.P(e.g. benzilidine acetone) so if we want to collect that liq. from mixture, we can use vaccume.
Can you give me reference about your answer......... Because i am confuse.......(Dr. john)
Dear Yogesh,
In a group of molecules which are constantly colliding, the energies of the molecules become different and form a distribution similar to the normal distribution but slightly skewed at the higher energy tail.
This is represented in gases by the Maxwell Boltzman curves.
Because of this effect, even if a liquid has a high boiling point, some molecules at room temperature (ie a proportion) will have very high energies and be able, on approaching the surface, to burst through and reach the gas phase.
This results in a population of molecules in the vapour form.
TFA is corrosive and irritant and it probably only needs a relatively small number of molecules in the air to have an unpleasant effect.
The speed with which these processes occur is quite remarkable.
I opened a reaction vessel containing chromium (II) salt in solution under carbon dioxide just for a very brief time, and in that period oxygen from the air managed to penetrate the flask and also almost the entire solution instantly destroying my hard won product!
Wikipedia is pretty good on this!
Hope this helps!
Regards,
Dr John
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