The Effects of Concentration on Cell Potential For the cell reaction 2Al(s) + 3 Mn^2+ (aq) → 2 Al^3+ (aq) + 3 Mn(s) ξ°cell = 0.48 V predict whether ξcell will be larger or smaller than ξ°cell for the following cases. a. [Al^3+] = 2.0 M, [Mn^2+] = 1.0 M b. [Al^3+] = 1.0 M, [Mn^2+] = 3.0 M

Question

The Effects of Concentration on Cell Potential
For the cell reaction

[latex]2 Al (s) + 3 Mn^{2+} (aq) → 2 Al^{3+} (aq) + 3 Mn(s) ξ°_{cell } = 0.48 V[/latex]

predict whether [latex] ξ_{cell } [/latex] will be larger or smaller than [latex] ξ°_{cell }[/latex] for the following cases.
a. [latex] [Al^{3+}] = 2.0 M, [Mn^{2+}] = 1.0 M[/latex]
b. [latex][Al^{3+}] = 1.0 M, [Mn^{2+}] = 3.0 M [/latex]

Accepted Answer

a. A product concentration has been raised above 1.0 M. This will oppose the cell reaction, causing [latex] ξ_{cell }[/latex] to be less than [latex] ξ°_{cell } ( ξ_{cell }[/latex] < 0.48 V).
b. A reactant concentration has been increased above 1.0 M, and [latex] ξ_{cell }[/latex] will be greater than [latex] ξ°_{cell }[/latex] ([latex] ξ_{cell }[/latex] > 0.48 V).

Question 11.4: The Effects of Concentration on Cell Potential For the cell ...

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