spm: chemistry - electrolysis
Post on 21-May-2015
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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
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