Calculate the standard cell potential, E degree, for each of the following react

Question

Calculate the standard cell potential, E degree, for each of the following reactions and predict whether or not reaction will take place spontaneously under standard conditions. Al(s) + Cr^3+(aq) rightarrow Al^3+ (aq) + Cr(s) 2 Ni(s) + 6 H^+ (aq) rightarrow 2 Ni^2+ (aq) + 3 H_2 (g) O_2 (g) + 2 Fe(s) + 4 H^+ (aq) rightarrow 2 Fe^2+ (aq) + 2 H_2 O(l) Consider the following galvanic cell that uses the reaction. Sn(s) + Sn^4+ (aq) rightarrow 2 Sn^2+ (aq) What is the potential of a cell at 25 degree C that has the following ion concentrations?

Explanation / Answer

8.

(a)

Eo cell = Eo ( Al3+/Al) - Eo ( Cr3+/Cr)

= - 1.66 - ( -0.74)

= - 0.92 volts

Eo cell is negative means reaction is spontaneous.

(b)

Eo cell = Eo ( Ni2+/ Ni) - Eo ( H)

= 0.23 - 0

= 0.23 volts

Eo cell is positive means reaction is non- spontaneous.

(c)

Eo cell = Eo ( Fe2+/ Fe) - Eo ( H)

= 0.41 - 0

= 0.41 volts

Eo cell is positive means reaction is non- spontaneous

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