Electrolytic cell: Converts electrical energy to chemical energy.

Electrolysis – Electrolytic Cell

Copper chloride

CuCl2

+-

Cu2+

Cl-Cu2+ (aq)+ 2e- Cu(s)

REDUCTIONCATHODE

2Cl- (aq) Cl2(g) + 2e-

OXIDATION Anode

Purifying Copper

Identify the anode cathode etc

-+

Cu2+ + 2e- CuCu2+ Cu Cu2+ + 2e- Cu 2+

Impure copper (metals)

dissolvingAnode

(oxidation)

Pure copper formingCathode

(Reduction)

sludge

-+

electronselectrons

Extraction of Aluminium

Al2O3

Al3+ O2-

Al3+ + 3e- Al (l)

2O2- O2 (g) +2e-

+

+ +

-

-

+

Cathode ( )

Voltaic (Galvanic) vs Electrolytic

Copper chloride

CuCl2

+-

Cu2+

Cl-

Cu2+ (aq)+ 2e- Cu(s)

REDUCTIONCATHODE

(-)

2Cl- (aq) Cl2(g) + 2e-

OXIDATION Anode(+)

_____

Zn

_

_

Cu

V

KNO3(aq)

+

>

Zn Zn2+ + 2e-

CuSO4

ZnSO4

Salt bridge

Anode (-) Zn + Cu2+ Zn2+ + Cu

oxidation reduction

REDUCING AGENT

OXIDISING AGENT

e-_

Cu2+ + 2e- Cu

Chemical Energy Electrical Energy Electrical Energy Chemical Energy

+ e-