QUESTION 13 1 points Save Answer Which off the following will increase the cell

Question

QUESTION 13 1 points Save Answer Which off the following will increase the cell potential for the folowing reaction: (aq) 2Fe(s) Use the reaction Ecell E cell (RT/nF)InQ and consider how each manipulation affects Q and thus affects Ecell Add zinc solid ncrease concentration of Fe n the solution 3+ Add solid iron to the system Dilute the entire system Remove water from the entire system O Increase the concentration of zinc ion in solution QUESTION 14 1 points save Answer Which of the following will decrease the cell potential for the following reaction: Use the reaction Ecell E cell (RTnF)lnQ and consider how each manipulation affects Q and thus affects Ecel O increase concentration of Fe3+ in the solution Add zinc solid O Add solid iron to the system O Remove water from the entire system O Increase the concentration of zinc ion in solution O Dilute the entire system

Explanation / Answer

13.

For this reaction : Q = [Zn2+]3/[Fe3+]2

Ecell will increase only if we are able to decrease the value of Q.

This is possible by :

Adding solid iron

Increasing [Zn2+] in solution

Both the above will cause the reaction equilibrium to shift towards left so the Q value will eventually decrease.

14.

Similarly, if we want to decrease Ecell , we need to increase Q which is possible by :

Adding solid zinc

Increasing [Fe3+]

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