I WILL CRY IF NO ONE CAN HELP ME THIS IS SO URGENT PLEASE IM SO DESPARET NOW OMG?

1) WHY ARE THE MPT OF SAMPLE 1 AND 2 DIFFERENT?

2) IDENTIFY WHICH ISOMER THE STUDENT ANALYSED.

Nitration of benzene

Reacted samples of phenol with reagents

Seperated the 2 organi prod from reaction by chromatography

Suspected 2 products were structural isomers with NO2 substitudes at 2 and 4 positions

Suspected structures =

2-nitrophenol

4-nitrophenol

Measured MPT of one of products, then recrystallised sample and took MPT of recrys. product

Sample 1 = MPT before recrys. 104-108 degres

2 = MPT after recrys - 110-114 degres

MPT from databse of structural isomers = 2-nitro isomer = 44 degrees

4-nitro isomer 112 degrees

1 Answer

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  • 8 years ago
    Favorite Answer

    Often [usually] mixtures melt lower than the pure substances.

    You likely had some of the ortho in there, or perhaps unreacted phenol.

    With luck you had NO trinitrophenol, aka, picric acid, which is prone to detonate.

    Source(s): chem engineer
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