问答题
Calculate the potential at 25℃ for the cell
Cd|Cd2+(2.00mol·L-1)||Pb2+(0.0010mol·L-1)|Pb
【正确答案】Solution: E(+)=EΘ(Pb2+/Pb)+0.0592V/21gc(Pb2+)
=-0.126V+(0.0592V/2)lg0.0010
=-0.215V
E(-)=EΘ(Cd2+/Cd)+0.0592V/21gc(Cd2+)
=-0.403V+(0.0592V/2)lg2.00
=-0.394V
E=E(+)-E(-)
=-0.215V-(-0.394V)
=0.179V
【答案解析】