5
AssignmentMultiple Select

Limiting Reactant and Percent Yield

Question 5 • LA-Chemistry A

How can you improve the percent yield of copper in this lab? Check all possible strategies that will help you do so.

Answer
A
Measure reactants precisely.
B
Stir to help the reaction take place.
C
Chill the reactants before combining them.
D
Wait patiently until the reaction completes.
E
Make sure to recover as much copper as possible.

Explanation

Percent yield increases when you obtain more of the copper product compared with the theoretical amount. Measuring reactants precisely, stirring to help the reaction proceed, and waiting for the reaction to finish can help more copper form. Recovering as much copper as possible prevents product loss. Chilling the reactants is not a reliable way to improve the yield and may slow the reaction.

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