Practice question
Question
What is the time (in seconds) required to deposit 0.355 g of cobalt from a CoSO₄ solution using a current of 0.2 A? (Atomic mass of Co = 59 g/mol, F = 96500 C/mol)
Explanation
Co²⁺ + 2e⁻ → Co . 1 mol Co (59 g) requires 2F. Moles = (0.355/59) = 0.006017 mol , Charge = 0.006017 × 2 × 96500 = 1161.24 C . t = (Q/I) = (1161.24/0.2) = 5806.2 s .
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