Practice question
Question
A cell Sn(s) | Sn²⁺(0.001 M) || I₂(s) | I⁻(0.02 M) | Pt(s) operates at 298 K. What is the cell potential? (Given: E°Sn²⁺/Sn = -0.14 V , E°I_₂/I⁻ = 0.54 V )
Explanation
E°cell = 0.54 - (-0.14) = 0.68 V . Ecell = 0.68 - (0.059/2) log ([Sn²⁺][I⁻]²/1) = 0.68 - 0.0295 log (0.001 × 0.0004) = 0.68 + 0.103 = 0.783 V .
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