Homework Help: Chemistry

Posted by Wiola on Monday, October 26, 2009 at 7:22am.

I was asked to write up the experiment that we did in class, but i was absent that day, and i really don't know anything about it, could someone plese help me,

the title of the experiment says : To obtain a pure sample of benzoic acid form an impure sample by the technique of recrystallisation.
that was part A
and the part B : To measure the melting point of benzoic acid

thank you for help

Chemistry - Dr Russ, Monday, October 26, 2009 at 9:52am
You can't really write up an experiment that you have not done.

It is usaully recrystallzed from water as it is very soluble in hot water and not very soluble in cold water. The result is needle shaped crystals.

I have no idea which method you will have used for the melting point. Simplest is a melting poitn apparatus. My school group used to use a boiling tube containing oil and the sample tied to a thermometer in the oil. The tube was heated by a bunsen.

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