Example Faraday's law 8.1 Discharging metal ions Solutions containing cations Ag+,Cu2+,Cr3+,Fe3+ and Ti4+ were electrolyzed using constant current. The electrolysis of each solution was terminated when 0.1 mole of the respective metal was deposited on the cathode. Select the solution for which the time needed for the electrolysis was the largest. Solution: n=Mm=zFQ=zFI=znQF=zconst Deposition of Cu2+(z=) will take times longer time than deposition of Ag+(z=1) Deposition of Ti4+(z=) will take times longer time than deposition of Ag+(z=1)