Question

How would the following affect the purity, melting point and yield of your product? Write increase,...

How would the following affect the purity, melting point and yield of your product? Write increase, decrease or no change. 12 pts.

You had a significant amount of aspirin contaminating your final product.

Purity:                                       Melting point:                                        Percent yield:                      

Your unknown was acetanilide, but you somehow contaminated it with phenacetin.

Purity:                                       Melting point:                                        Percent yield:    

You inadequately dried your unknown.

Purity:                                       Melting point:                                        Percent yield:                      

You used an excessive amount of water to recrystallize your product.

Purity:                                       Melting point:                                        Percent yield:

Homework Answers

Answer #1

1. when a significant amount of aspirin contaminating final product,

Purity: Decreases

Melting point: Decreases

Percentage yield: Increases

2. When unknown was acetanilide, but somehow contaminated with phenacetin,

Purity: Decreases

Melting point: Decreases

Percentage yield: increases

3. Sample was inadequately dried

Purity: No change

Melting point: Increases

Percentage yield: Increases

4. When an excessive amount of water was used to recrystallize the product,

Purity: Increases

Melting point: Increases

Percentage yield: Decreases

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