Electroloysis

Question 1

SIMPLE electrolysis

Answer 1

*ALL molten electrolytes (no water to worry about)
Anion (-) goes to Anode (+)
Cation (+) goes to Cathode (-)

Question 2

SIMPLE EG:

What happens to copper chloride in simple electrolysis, describe.

Answer 2

Chloride ions (-) go to Anode (+)
Copper ions (+) goes to Cathode (-)
At the Anode chlorine gas is realised (can see bubbling)
At the Cathode copper turns into an atom around electrode (can see orange substance)
CuCl2

Question 3

CuSo4 ELECTROLYSIS

Using copper electrodes

Answer 3

In this the copper ions come off from the Anode replacing the ones taken by the Cathode.
It goes from atom to ion to atom.

Question 4

CuSo4 EG:

What are the equations in this electrolysis, label.

Answer 4

Cathode/reduction:
Cu2++2e-> Cu (to atom)
Anode/oxidation:
Cu-2e->Cu2+ (to ion)

Question 5

SOLUTION ELECTROLYSIS

Reactivity series

Answer 5

This is when the reactivity series comes into play.
Cathode - Attracts Cation and Hydrogen(H+)
Anode - Attracts Anion and Hydroxide(OH-)
At the Cathode, if the Cation is less reactive than Hydrogen the metal forms, otherwise Hydrogen forms. At the Anion Oxygen (see equations) always will form unless the Anion is Cl- / Br- / I-

Question 6

SOLUTION EG:

What are the equations at the Anode and Cathode with CuSo4 in a solution with water.

Answer 6

Anode:
4OH- - 4e- > O2 + 2H2O
Cathode:
Cu2+ + 2e- > Cu