Question

The reactants of two chemical equations are listed.

Equation 1: CuSO4 and NaOH
Equation 2: Fe and CuSO4

Based on the type of reaction, which reaction can be used to extract copper metal from copper sulfate solution?

A - Equation 2, because Fe being more reactive, replaces Cu from CuSO4
B - Equation 2, because Fe being more reactive, replaces S from CuSO4
C - Equation 1, because Na being more reactive, exchanges position with Cu in CuSO4
D - Equation 1, because Na being more reactive, exchanges position with S in CuSO4

Answer 1

The correct answer is b

Answer 2

The reaction that can be used to extract copper metal from copper sulfate solution would be equation 2.

Fe will displace Cu from CuSO4 because it is more reactive. In other words, Fe ranks higher than Cu in the reactivity series.

Thus:    $Fe + CuSO_4 ---> Cu + FeSO_4$

Even though Na will displace Cu from CuSO4, equation 1 will result in the formation of Cu(OH)2 instead of free Cu because it is a double replacement reaction.

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