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chem aqa mechanism help

Outline a mechanism for the formation of ethylamine from bromoethane. State
why the ethylamine formed is contaminated with other amines. Suggest how the
reaction conditions could be modified to minimise this contamination.

The first part of the question is fine, but could someone explain the "modify" part? The answer is excess NH3, but wouldn't that mean more amines form since further substitution can occur? Ty
Original post by nethmi12345
Outline a mechanism for the formation of ethylamine from bromoethane. State
why the ethylamine formed is contaminated with other amines. Suggest how the
reaction conditions could be modified to minimise this contamination.

The first part of the question is fine, but could someone explain the "modify" part? The answer is excess NH3, but wouldn't that mean more amines form since further substitution can occur? Ty

The idea is that the concentration of ammonia is much higher than that of bromoethane, so the chance of the bromoethane reacting with an amine is much lower than the chance of the bromoethane reacting with ammonia - result should be that further substitutions are reduced and the contamination by other amines is reduced.

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