. What type of a battery is the lead storage battery


(a) What type of a battery is the lead storage battery? Write the anode and the cathode reactions and the overall reaction occurring in a lead storage battery when current is drawn from it.

(b) In the button cell, widely used in watches, the following reaction takes place

Determine

(a) Define molar conductivity of a solution and explain how molar conductivity changes with change in concentration of solution for a weak and a strong electrolyte.

(b) The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500 KCl What is the cell constant if the conductivity of 0.001 M KCl solution at 298 K is 0.146 × 10–3 S cm–1?

Best Answer

(a) Lead storage battery is a secondary battery. The reactions occurring in lead storage battery when current is drawn from it are:

storage battery

                                                                                 OR

(a) Molar conductivity of a solution at a given concentration is the conductance of the volume V of the solution containing one mole of electrolyte kept between two electrodes with area of cross section A and distance of unit length.

Strong electrolyte

(b) R = 1500 KCl ; k = 0.146 × 10–3 S cm–1

     Substituting the values in the expression,

                Cell constant = k × R

                Cell constant = 0.146 × 10 –3 S cm–1 × 1500KCl

                                      = 0.219 cm–1

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