number one only estions I. li ti experiment, whal is the purpose oi allowins 2.
ID: 500940 • Letter: N
Question
number one only
Explanation / Answer
1)
a) In the experiment, the temperature not to go above 350C when sodium dichromate is added to the alcohol, because reaction should take place with the evolution of heat. Add 1ml sodium dichromate solution to the alcohol with vigorous swirling. Add the rest of the dichromate solution with continuous swirling at a rate that keeps the temperature between 25- 35 0C.
b) The purpose of oxalic acid to destroy any excess dichromate in the experiment.
c) Add about 15 g of sodium chloride to the distillate and swirl until most of it has dissolved. Transfer the mixture to a seperatory funnel the lower aqueous layer. The purpose of NaCl is to absorb impurity.
d) Anhydrous magnesium sulfate, soak up water, because it is a drying agent.
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