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| What are molar conductivity and limited molar conductivity? Calculate the dissociation constant of 0.02 mol dm−3 ethanoic acid, if its molar conductivity is 11.57 × 10−4 S m2 mol−1 and limited molar conductivity is 3.90 × 10−2 S m2 mol−1. |
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Given the following reaction half reaction: Cd2+ + 2e ï‚® Cd Eï‚° = ï€ 0.403 V Pb2+ + 2eï€ï‚®Pb Eï‚° = ï€ 0.126 V where [Cd2+] = 0.020 M and [Pb2+] = 0.200 M construct a galvanic cell using half cell reactions and find
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i) Which half cell –reaction is the cathode? ii) Write the cell reaction. iii) Calculate Eï‚°cell of this galvanic cell. iv) Calculate Ecell of this galvanic cell v) Calculate equilibrium constant using Eï‚°cell potentials of this galvanic cell based on the construction of ions
Write five main features of coulometric methods.
At 298, the limited molar conductivity at infinite dilution of sodium benzoate, hydrochloric acid and sodium chloride are 8.24 ï‚´ 10ï€3 S m2 molï€1, 4.26 ï‚´ 10ï€2 S m2 molï€1 and 1.26 ï‚´ 10ï€2 respectively. Calculate the limiting molar conductivity of aqueous benzoic acid.
How the conductance is varies with concentration? Explain with the help of suitable examples.
What is the cell potential of an electrochemical cell made of a cadmium electrode in a 0.1 M Cd(NO3)2 solution and chromium electrode in a 1 × 10−4 M Cr(NO3)3 solution.
A solution of Zn is electrolysed for 30 s using a current if 1.0 mA. Calculate the mass of Zn plated on the electrode for the electrochemical reaction: Zn2+ + 2e ï‚® Zn