Electrochemistry

Question 1

what are the half equations for the purification of copper?

Answer 1

Cu2+ to Cu solid and back

Question 2

what are the half equations for the anodisation of aluminium?

Answer 2

[o] 2Al +3H2O -> Al2O3 + 6H+ + 6e- (oxi of H2O, rxn w Al)
[R] 2H+ +2e- -> H2

Question 3

what is the solid aluminium layer in the anodisation of aluminium?

Answer 3

Al2O3 (s)

Question 4

impure copper and pure copper <=> anode and cathode?

Answer 4

pure: cathode
impure: anode

Question 5

setup for purification of copper?

Answer 5

impure copper solid anode (+), pure copper cathode, dilute CuSO4 solvent

Question 6

setup for anodisation of aluminium?

Answer 6

anode Al solid (+), cathode Pt, dil. H2SO4 solvent

Question 7

steps for redox equation?

Answer 7

EOHC for each half eqn, then combine