Experimental techniques: Carrying out a chemical reaction with heat, using TLC t

Question

Experimental techniques: Carrying out a chemical reaction with heat, using TLC to follow a chemical reaction, use of a pluringe to measure liquid reagents, isolation of a solid product by crystallization, melting point determination.

Answer the following questions:

Why should the glassware be dry for this experiment?

Why might water contamination be a problem when using the reagent acetic anhydride; what byproduct might form due to moisture?

Experimental techniques: Carrying out a chemical reaction with heat, using TLC to follow a chemical reaction, use of a pluringe to measure liquid reagents, isolation of a solid product by crystallization, melting point determination.

Explanation / Answer

a) The glassware should be dry for the experiment hence it will react with the H2O to form two moles of acetic acid in the case of acetic anhydride

b) The acetic anhydride will react with water to from mixture of two acetic acid

The reaction taking place will be

CH3-CO-O-CO-CH3 + H2O -----> 2CH3COOH, hence hte water contamination is a problem when the reagent is acetic anhydride

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