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EMF measurement
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Assignments:

 

  1. What is the electrode potential of  «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»M«/mi»«msup»«mi»g«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»/«/mo»«mi»M«/mi»«mi»g«/mi»«/math» electrode in which conc. of  Mg2+ is 0.01 M? «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msubsup»«mi»E«/mi»«mrow»«mi»M«/mi»«msup»«mi»g«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»/«/mo»«mi»M«/mi»«mi»g«/mi»«/mrow»«mn»0«/mn»«/msubsup»«/math»=-2.36 V.

 

 
  1. 100 mL of a neutral solution containing 0.2 g of copper was electrolysed till the whole of copper was deposited. The current strength was maintained at 1.2 «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»A«/mi»«/math» and the volume of solution was maintained at 100 mL. Assuming 100% efficiency, find out the time taken for deposition of copper. [At.wt of copper =63.58]

 

  1. The reduction potentials of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»C«/mi»«msup»«mi»u«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»/«/mo»«mi»C«/mi»«mi»u«/mi»«/math» and «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»A«/mi»«msup»«mi»g«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»/«/mo»«mi»A«/mi»«mi»g«/mi»«/math» electrode are 0.34 V and 0.80 V respectively. Construct a galvanic cell using these «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msubsup»«mi»E«/mi»«mrow»«mi»R«/mi»«mi»e«/mi»«mi»d«/mi»«/mrow»«mn»0«/mn»«/msubsup»«/math» values. For what concentration of Ag+ ions will e.m.f of the cell at 25 0C be zero if conc. of Cu2+ is 0.01 M.

 

  1. Calculate the maximum work that can be obtained from the Daniel cell «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»Z«/mi»«mi»n«/mi»«mo»/«/mo»«mi»Z«/mi»«msup»«mi»n«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mfenced»«mrow»«mi»a«/mi»«mi»q«/mi»«/mrow»«/mfenced»«mo»§#8741;«/mo»«mi»C«/mi»«msup»«mi»u«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mfenced»«mrow»«mi»a«/mi»«mi»q«/mi»«/mrow»«/mfenced»«mo»/«/mo»«mi»C«/mi»«mi»u«/mi»«/math». Given that «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msubsup»«mi»E«/mi»«mrow»«mi»Z«/mi»«msup»«mi»n«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»/«/mo»«mi»Z«/mi»«mi»n«/mi»«/mrow»«mn»0«/mn»«/msubsup»«/math» and «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msubsup»«mi»E«/mi»«mrow»«mi»C«/mi»«msup»«mi»u«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»/«/mo»«mi»C«/mi»«mi»u«/mi»«/mrow»«mn»0«/mn»«/msubsup»«/math» are -0.76 and +0.34 V respectively.

 

  1. For Daniel Cell involving the cell reaction,,the standard free energies of Zn (s), Cu (s), Cu2+ (aq) and Zn2+ (aq) are 0, 0, 64.4 KJmol-1 and -154.0 KJmol-1 respectively. Calculate the standard EMF of the cell.

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