Practicing Success
Silver is electrodeposited on a metallic vessel of surface area 800 cm2 by passing a current of 0.20 amp for 3.0 hrs. The thickness of silver deposited ___. Given its density is 10.47g/cc [Atomic weight of Ag = 108] |
3.2 × 10–4 cm 1.29 × 10–4 cm 2.88 × 10–4 cm 4.2 × 10–3 cm |
2.88 × 10–4 cm |
The correct answer is option 3. 2.88 × 10–4 cm. Let the thickness of the silver deposited be \(x\) cm. Weight of silver deposited = density x V = \(10.47 × 800x\)g We know, from Faraday's law we know that \(W = Zit\) \(10.47 × 800x = \frac{108}{96500} × 0.2 × 3 × 3600\) \(x = \frac{108 × 0.2 × 3 × 3600}{96500 ×10.47 ×800}\) or, \(x = \frac{233280}{808284000}\) or, \(x = 2.88 × 10^{− 4} cm\) |