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NEET-XII-Chemistry

03: Electrochemistry

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  • #10
    The conductivity of sodium chloride at 298 K has been determined at different concentrations and the results are given below:

    Concentration/M 0.001 0.010 0.020 0.050 0.100

    102 × κ/S m-1 1.237 11.85 23.15 55.53 106.74

    Calculate for all concentrations and draw a plot between and c½. Find the value of.
    Ans : Given,

    κ = 1.237 × 10-2 S m-1, c = 0.001 M

    Then, κ = 1.237 × 10-4 S cm-1, c½ = 0.0316 M1/2





    = 123.7 S cm2 mol-1

    Given,

    κ = 11.85 × 10-2 S m-1, c = 0.010M

    Then, κ = 11.85 × 10-4 S cm-1, c½ = 0.1 M1/2





    = 118.5 S cm2 mol-1

    Given,

    κ = 23.15 × 10-2 S m-1, c = 0.020 M

    Then, κ = 23.15 × 10-4 S cm-1, c1/2 = 0.1414 M1/2





    = 115.8 S cm2 mol-1

    Given,

    κ = 55.53 × 10-2 S m-1, c = 0.050 M

    Then, κ = 55.53 × 10-4 S cm-1, c1/2 = 0.2236 M1/2





    = 111.1 1 S cm2 mol-1

    Given,

    κ = 106.74 × 10-2 S m-1, c = 0.100 M

    Then, κ = 106.74 × 10-4 S cm-1, c1/2 = 0.3162 M1/2





    = 106.74 S cm2 mol-1

    Now, we have the following data:





    		 0.0316
    		 0.1
    		 0.1414
    		 0.2236
    		 0.3162

    		123.7
    		 118.5
    		 115.8
    		 111.1
    		 106.74





    Since the line interruptsat 124.0 S cm2 mol-1, = 124.0 S cm2 mol-1.