Melting point determination is being used to estimate the relative purity of the

Question

Melting point determination is being used to estimate the relative purity of the generated aspirin crystals. What does a melting point lower than 135ºC suggest of the crystal lattice?

a. There are impurities in the crystal lattice, disrupting uniformity and lowering the melting point.

b. No product was generated, and only salicylic acid was produced.

c. Aspirin cannot be the major product of the reaction, and another product was formed.

d. The wrong solvent was used for the reaction, causing a reduction of the carbonyl.

Explanation / Answer

Melting point of pure aspirin = 135C

Melting point of salicyclic acid = 158-160

Since the melting happens at less than 135C, the sample cannot be pure aspirin

b) Statement is wrong, since if that was the cause melting point would have been 158-160C

c) Not correct, since if aspirin is not the major product, then the melting point will be touching below 158-160 mark

d) The wrong solvent will won't even cause the reaction to occur

Hence the correct answer is Option A

There are impurities in the crystal lattice, disrupting uniformity and lowering the melting point.

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