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An electrochemical cell is made of aluminium and tin electrodes with their standard reduction potentials -1.66 V and 0.14 V respectively. Select the anode and the cathode, represent the cell and write the cell reaction. Find the e.m.f.of the cell |
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Answer» Solution :For `E_(cell)` to be positive, the GIVEN standard reduction potentials show that oxidation will take place on Al-electrode. HENCE, Al will be anode and SN will be CATHODE. The cell will be REPRESENTED as: `Al(s)|Al^(3+)(aq)||Sn^(2+)(aq)|Sn(s)` ltBrgt `E_(cell)^(@)=E_(Sn^(2+),Sn)^(@)-E_(Al^(3+),Al)^(@)=0.14-(-1.66)=1.80V` |
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