1.) A student finds the melting point of a pure compound to be 112 - 114°C. If a

Question

1.) A student finds the melting point of a pure compound to be 112 - 114°C. If a

small impurity were added to the compound, the student should expect the

melting point to be:

a) < 112°C

b) 112-114°C

c) > 114°C

2. ) Imagine you have done a Melting Point and received a values between 82 to

83 degrees C. You then mixed the chemical with 1-chloro- 4-nitrobenzene and found a

melting point of 55 degrees C. From the list below what is the proper molecule is it most

likely to be?

Compound Literature mp (oC) A biphenyl 69-72 2,5-dimethyl phenol 68-71 1-chloro-4- 83-84 nitrobenzene 4-hydroxy-3- 81-83 methoxy benzaldehyde C m toluamide 94-96 Methyl-4-nitro 94-96 benzoate phenanthrene 99-101 D o-toluic acid 103-105 E acetanilide 113-115 114-116 fluorene 122-123 benzoic acid 122-123 trans-stilbene 132.5-133 LG Cinnamic acid 132.5-133 urea

Explanation / Answer

1. Ans: If a compound contaminated with impurities. Its melting point decreases. So your melting point is less than 112 oC.

2. Ans. Your pure compound melting point is 82 to 83 degrees. From above the list your compound is 4-hydroxy-3-methoxy benzaldehyde.

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