More products~more spontaneous EK question 159

[rls303]

Hi guys,
I think I'm having a big brain fart here. For question 159 on the Electrochemistry Chapter (Lecture questions from actual EK book), it says that according to LeChatlier's principle, if you increase the concentration of the product, the reaction will be less spontaneous and less spontaneous correlates to a lower reaction potential.

What equation are they using to say this?

Thanks in advance

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[Rabolisk]

G, Q, and E.

 

[rls303]

G, Q, and E.

Hi,
Yes I understand that we have the
dG=dH-TdS

and the dG=d*G+RTlnQ

but I'm just not understanding how this all relates.?

 

[PiBond]

Hi,
Yes I understand that we have the
dG=dH-TdS

and the dG=d*G+RTlnQ

but I'm just not understanding how this all relates.?

if i increase my reaction quotient (Q) by increasing the amount of products then the reaction becomes less favorable as a result in a more positive value for dG (using the above equation). if we think of it in terms of Le Chatlier's, we know that increasing product concentrations will decrease the rate of the forward reaction and increase the rate of the reverse reaction

this is also shown in the nernst equation