Question

An aqueous ScF3 solution is electrolyzed under 1 bar pressure using platinum electrodes. (a) Write the...

An aqueous ScF3 solution is electrolyzed under 1 bar pressure using platinum electrodes.

(a) Write the half-reactions predicted to occur at the anode and cathode, based on the standard cell potentials given below.

Standard Reduction Potentials (Volts) at 25 °C

F2(g) + 2 e- ---------> 2 F-(aq)

2.870

O2(g) + 4 H3O+(aq) + 4 e- --------> 6 H2O(l)

1.229

2 H2O(l) + 2 e- -------> H2(g) + 2 OH-(aq)

-0.828

Sc3+(aq) + 3 e- ---------> Sc(s)

-2.080


Half-reaction at anode:

+ + -------------->   + +



Half-reaction at cathode:

+ + ------------>   + +



(b) What is the expected decomposition potential?_______ V

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Answer #1

Anode- oxidation takes place

Cathode- reduction takes place

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