SPM: Chemistry - Electrolysis

CHEMISTRY ELECTROCHEMISTRY

Pb2+ + 2 Br –

Pb2+ + 2 e– Pb 2 Br – Br2 + 2 e–

Cu2+ + 2 Cl –

Cu2+ + 2 e– Cu 2 Cl – Cl2 + 2 e–

2Al3+ + 3 O2–

Al3+ + 3 e– Al 2 O2– O2 + 4 e–

+ –

Ag+ Cu2+ H+ Pb2+ Fe2+ Zn2+ Al3+ Mg2+ Na+ K+

OH– I– Br – Cl– NO3– SO4

2– F–

– +

Copper(II) nitrate, Cu(NO3)2

Cathode Zinc nitrate, Zn(NO3)2

Anode

Lead (II) nitrate, Pb(NO3)2

Anode

Silver (I) nitrate, AgNO3

Cathode

Iron(II) nitrate, Fe(NO3)2

Anode

Nickel (II) nitrate, Ni(NO3)2

Cathode

Gold (I) nitrate, AuNO3

Cathode

Tin(II) nitrate, Sn(NO3)2

Anode

Copper(II) nitrate, Cu(NO3)2

Anode

Silver (I) nirate, AgNO3

Cathode

Cu2+ + 2 e- Cu Zn Zn2+ + 2 e- Cu2+ + Zn Cu + Zn2+

Pb Pb2+ + 2 e- Ag+ + e- Ag

2 Ag+ + Pb 2 Ag + Pb2+

Ni2+ + 2 e- Ni Fe Fe2+ + 2 e- Ni2+ + Fe Ni + Fe2+

Cu Cu2+ + 2 e- Ag+ + e- Ag

2 Ag+ + Cu 2 Ag + Cu2+

X √ √

√ √ √

X X √

X X X

Cu < Pb < Zn < Mg