This experiment is the Geometric Isomerism. So basically the in the beginning of

Question

This experiment is the Geometric Isomerism. So basically the in the beginning of the experiement the maleic acid (Cis-transomer) will convert (isomerized) to fumaric acid (trans form) at the end.

1) In step one, why do you weigh the sample (maleic acid) after powdering it rather than before?

2) Why is it necessary to recrystallize your product? How do you know when to recrystallize a compound? (This is after we already boil the solution)

3) Why isn't Norit (decolorizing charcoal) used on the product in this reaction?

4) If your product is not completely dry when measuring the melting point, it may appear to melt at 100 degrees celcius. Why?

Explanation / Answer

1) the intramoleqular hydrogen bonding gets weak strength.

2) Recrystallization is to remove impurities from a solid. So if it is an impure substance, then it needs to be recrystallized.

3) there is double bond in reactant so not easy to roatate the double bond.

4) If your product is not completely dry when measuring the melting point, it may appear to melt at 100 degrees celcius because the product soluble in the water.

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