Use the References to access important values if needed for this question. An aq

Question

Use the References to access important values if needed for this question.

An aqueous ScCl3solution 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.

1.360

1.229

-0.828

-2.080

Half-reaction at anode:

Half-reaction at cathode:

(b) What is the expected decomposition potential? ____V

Enter electrons as e-. Use smallest possible integer coefficients. States are not required. If a box is not needed, leave it blank.

Explanation / Answer

Two possible reductants are : Sc^3+ and O2. But as O2 is present is aqueous solution in a very small amount, Sc^3+ will redyced.

Cathodic reaction : Sc^3+ + 3e- ---> Sc (s)

To possible oxidants are : Cl^- and H2O. But as the oxidation potential of Cl^-/Cl is smaller than that of H2O, Cl^- will re oxidised.

Anodic reaction : 2Cl^- ----> Cl2 + 2e-

expected decomposition potential = -2.08 V + (-1.36) = -0.72 V

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