Old aspirin exposed to moisture often smells like acetic acid (vinegar). When aspirin is heated in boiling water, it decomposes
and gives off a vinegar smell. The resulting solution gives a positive FeCl3 test. Why is this test positive? (Please explain in detail!)
Write the chemical equation for the reaction of aspirin and water at high temperature.
Write the chemical equation for the reaction of aspirin and water at high temperature.
1 answer:
Explanation:
Vinegar like smell is given off by aspirin when we tend to heat it in boiling water. The main cause of this vinegar like smell is due to the formation of acetic acid and a phenolic acid upon heating of aspirin.
As a result, it gives a positive test when treated with ferric chloride, that is, .
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Explanation:
It is given that vapor pressure of liquid iodomethane is 40.0 mm Hg. So, if we calculate the vapor pressure according to the given values and if its value will be greater than the the given vapor pressure of iodomethane then it means that some of the vapors has converted into liquid state.
As the given values are as follows.
= 72.0 mm Hg,
= 404 K
= ? ,
= 249 K
As volume is constant so, according to Gay-Lussac's law pressure is directly proportional to temperature.
(at constant volume)
or, = k
Therefore, the formula to calculate the value of is as follows.
=
=
= 44.37 mm Hg
As calculated vapor pressure is more than the given vapor pressure. Hence, the liquid will convert into gas.
As a result, no condensation will occur and only vapors of iodomethane will be present.