Electrolysis

Return to the Atoms and Molecules Page.
<= Back Next =>
When electricity is passed through an liquid solution of an ion or an electrolyte, a chemical reaction called electrolysis occurs. When electricity flows, chemical changes happen. For example, lets take a solution of sodium chloride. At the positive electrode, the anode, oxidation occurs as electrons are pulled from negatively charged chloride ions. 
2Cl- ==> Cl2 + 2e-
At the negative electrode, the cathode, reduction occurs as electrons are added to positively charged sodium ions. 
Na+ + e- ==> Na
In affect, it splits the sodium and chlorine back into their elements.
Remember the anode is where oxidation occurs (remember "an ox"). The cathode is where reduction occurs (remember "red cat").
Next =>