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CBSE Class 12-science Answered

For what concentration of Ag+ will the EMF of te given cell be zero at 25 C .If the concentration of Cu2+ is 0.1 M. EoAg+ = 0.80v and Eo Cu2+ = 0.34 V
Asked by Jsiajaijiaia | 27 Aug, 2019, 12:23: AM
Expert Answer
Chemical equations for this cell can be written as-
 
At space Cathode minus 2 Ag to the power of plus space plus space 2 straight e to the power of minus rightwards arrow 2 Ag At space Anode minus Cu space rightwards arrow Cu to the power of plus 2 end exponent plus 2 straight e to the power of minus Complete space reaction minus 2 Ag to the power of plus plus Cu rightwards arrow Cu to the power of plus 2 end exponent plus 2 Ag According space to space Nernst space equation minus straight E subscript cell space equals space straight E to the power of straight o subscript cell minus fraction numerator.0591 over denominator 2 end fraction log fraction numerator open square brackets Cu to the power of plus 2 end exponent close square brackets over denominator open square brackets Ag to the power of plus close square brackets squared end fraction space straight E to the power of straight o subscript cell equals straight E to the power of straight o subscript cathode minus straight E to the power of straight o subscript anode space space space space space space space space space space equals 0.80 minus 0.34 equals 0.46 straight V 0 equals 0.46 minus fraction numerator.0591 over denominator 2 end fraction log fraction numerator 0.1 over denominator open square brackets Ag to the power of plus close square brackets squared end fraction fraction numerator 0.46 cross times 2 over denominator.0591 end fraction equals log fraction numerator 0.1 over denominator open square brackets Ag to the power of plus close square brackets squared end fraction left square bracket Ag to the power of plus right square bracket equals 10 to the power of negative 8.28 end exponent space straight M
Answered by Ravi | 28 Aug, 2019, 12:56: PM

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