Original Concentration of Ag+

Question

It took 2.30 min using a current of 2.00 A to plate out all the silver from 0.250 L of a solution containing Ag+. What was the original concentration of Ag+ in the solution?

Answer 1

2.30 min x 60sec/min = 138 sec

2.00 C/sec x 138 sec = 276 C

276 C x 1 mol e-/96485C x 1 mol Ag/mol e- = 0.00286 mol Ag

Original [Ag+] = 0.00286 mol/o.250 L = 0.0114 M