Use the References to access important values if needed for this question. Enter
ID: 1019158 • Letter: U
Question
Use the References to access important values if needed for this question. Enter electrons as e-. Use smallest possible integer coefficients. States are not required. If a box is not needed, leave it blank. An aqueous SnI2 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
I2(s) + 2 e- 2 I-(aq) 0.535
O2(g) + 4 H3O+(aq) + 4 e- 6 H2O(l) 1.229
2 H2O(l) + 2 e- H2(g) + 2 OH-(aq) -0.828
Sn2+(aq) + 2 e- Sn(s) -0.140
Half-reaction at anode:
Half-reaction at cathode:
(b) What is the expected decomposition potential? V
Explanation / Answer
anode half reaction :
Sn (s) -------------------> Sn+2 (aq) + 2e-
cathode half reaction:
I2 (s) + 2e- -----------------> 2I- (aq)
b)
decomposition potential = Eo cathode - Eo anode
= 0.535 - (-0.140)
= 0.675 V
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