1)A student purified the acetanilide by using recrystalization experiment and he

Question

1)A student purified the acetanilide by using recrystalization experiment and he got the following results. Based on the following results answer the questions.

Starting weight of Acetanilide: 1.324g.

Melting Point of Starting acetanilide: 98.2-105.3 degrees C.

Weight obtained after recrystalization 0.954 g.

Melting Point of recrystallized acetanilide:112.2-114.3 degrees C.

Melting point of pure acetanilide (Literature Value); 114.3 degrees C.

a) Calculate the % yeild of recrystallization experiment?

b) Explain the purity of recrystallized product?

2) How did you check the purity of acetanilide at the end of the experiment? Was your product pure, Explain your judgement?

Explanation / Answer

Recrystallization of crude acetanilide

a) % yield of recrystallization = 0.954 g x 100/1.324 g =

b) The recrystallized acetanilide is having higher purity than the starting material. Purity of the material is defined by the percentage of impurity present in it. Acetanilide at the beginnning had much higher percentage of impurity in it, which lowered the melting point of the material and we got a wide range for the melting point. The recrystallized product having very low or almost no impurity left in it, gave a much sharp melting point compared to the starting material.

c) The purity of the recrystallized acetanilide was checked by melting point determination. The product showed a sharp melting point which is close to the reported melting point in the literature and therefore the material is pure.

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