8/19/2019 Ionic Half Equations

http://slidepdf.com/reader/full/ionic-half-equations 1/5

8/19/2019 Ionic Half Equations

http://slidepdf.com/reader/full/ionic-half-equations 2/5

%ure copper forms on the cathode. !he slideshow shows how this

works$

8/19/2019 Ionic Half Equations

http://slidepdf.com/reader/full/ionic-half-equations 3/5

During electrolysis, the anode loses mass as copper dissolves, and the cathode

gains mass as copper is deposited.

The slideshow shows what happens during the purification of copper by

electrolysis:

8/19/2019 Ionic Half Equations

http://slidepdf.com/reader/full/ionic-half-equations 4/5

8/19/2019 Ionic Half Equations

http://slidepdf.com/reader/full/ionic-half-equations 5/5

 A half-equation shows what happens at one of the electrodes during electrolysis.

Electrons are shown as e-.

These are the half-equations:

anode: u ! u&' " #e- $oxidation%

cathode: u&' " #e- ! u $reduction%

&'idation happens at the anode because electrons are lost. (eduction

happens at the cathode because electrons are gained.

&ne way to remember this is by using the mnemonic OIL RIG:

O'idation Is Loss of electrons, Reduction Is Gain of electrons.