Question

Silver is removed electrolytically from $200 \,mL$ of a $0.1\, N$ solution of $AgNO _{3}$ by a current of $0.1\, A$. How long will it take to remove half of the silver from the solution?

• A. 0.1 s
• B. 100 s
• C. 965 s
• D. 9650 s

Answer 1

Answer: (D)

9650 s

Answer 2

$Mmoles \, A g N O _{3}= 0 . 1 \times 2 0 0 = 2 0\\\ A g ^{\oplus}+ e ^{-} \rightarrow A g$ $For \, 50 \%$ electrolysis, $10 \,mF \,$ is required $\Rightarrow 10\, mF =\frac{1 t }{96500} \Rightarrow t = 9650 s$