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May 28, 2015

Homework Help: Chem Urgent Help ?

Posted by Juliana on Saturday, November 22, 2008 at 9:16pm.

I have a lab dis monday .. plz someone help .. Lab Title is
(( Recrystallization of a Solid ))

Pre-Lab Questions....


Explain the purpose of the following in this experiment.

a) using hot filtration

b) not cooling (chilling) the hot filtered solution immediately

c) washing the crystals in the final step with ice cold water

d) using gravity filtratoin ( not vacuum filration) in the hot filtration step

e) using a stemless funnel in the hot filration step

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in the experiment we have to determine the MP ( literature value 114 C ) ... and percent mass recovery of acetanilide in teh orginal mixture ..

ANY clue how to approach to dese problems.. or is dere any kind of formula .. ot steps ..

Thnks for ur help in advance

REally appreciate ur help ..

thnks again

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