| Chapter 17 |
| OIL - Oxyidation is ( loss of electrons) RIG - Reduction is (gain of electrons) The best oxyidizing agent = the one most easily reduced (most postive) Best reducing agent= the one most easily oxydized (most negative) Electrochemical cells- produce or use electricity voltaic cells- are spontaneous electrolytic cells- are non spontaneous First battery- Volta Anode- negative- site of OIL Cathode- postive- site of RIG The ability to move electrons through a wire is called potential- measured in volts In electroplating the object being plated is the cathode |
| Calculate E at 25 C for the cell. Ag+ + e- --> Ag (s) + .8 volts Ni 2+ + 2e- --> Ni (s) -.23 volts E= E* - .0592/n Log Q 2Ag+ +2e- --> 2 Ag (s) .8V +Ni (s) --> Ni 2+ + 2e- .23V ------------------------------------ 2Ag+ + Ni (s) --> 2Ag (s) + Ni 2+ 1.03 V = E* E= 1.03 - (.0592 / 2) log ([Ni2+] / [Ag+]^2) E= 1.03- (.0592 / 2) log (1x10^-3 / (1.6x10^-10)^2 E= .5388 volts |
| Example: |