Question

1a. How much current is required to electroplate a metal surface with 0.123 g nickel metal from a solution of Ni2+(aq) in 101 seconds?

= _ A

1b. Molten CaCl2 can be electrolyzed to form metallic Ca. For what duration should an electrolysis be performed at a current of 2.27 A in order to produce 15.6 g Ca?

= _ s

Answer 1

1.a m w = 6.123 gm I = ? t = 101 sec. MM ni = 58.699mhol Eqt wt. E = 58.69 n = 2 2 F: 96485.34C W= [ xixt 96485:34 0.123 = 58.69/2_xix. 10) 96485.34 i = 4.04 Amp. W =15.6gm ž= 2.27A 1.b t s F-96485.34 C MM ca = 40.08 gm med n=2 E = 40.08 - 20:04 we mixt 96485.34 15.6 - 20.04 96485.34 x 2.27Xt t = 33087.38 sec. ar to 3.31 x 104 sec.