Question

How long in minutes would it take to electroplate a spoon with 0.50 g of silver (107.87 g mol -1) at a constant current of 0.22 A using AgNO3?

Answer 1

Electrolysis equation is:

Ag1+ + 1e- ------> Ag

1 mol of Ag requires 1 mol of electron

1 mol of electron = 96485 C

So,1 mol of Ag requires 96485 C

let us calculate mol of element deposited:

use:

number of mol, n = mass/molar mass

= 0.5/107.87

= 4.634*10^-3 mol

total charge = mol of element deposited * charge required for 1 mol

= 4.634*10^-3*9.649*10^4

= 4.471*10^2 C

use:

time = Q/i

= 4.471*10^2/0.22

= 2.032*10^3 seconds

= 2.032*10^3/60 min

= 33.87 min

Answer: 34 min