Calculate the molar conductance at infinite dilution of ethanoic
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    Electrochemistry

    Multiple Choice QuestionsShort Answer Type

    271. The conductivity of 0.1 M KCl solution at 298 K is 0.0129 s cm–1. The resistance of this solution in a conductivity cell is found to be 58 ohms. What is the cell constant of the cell? The 0.1 M AgNO3 solution at 298 K in the same conductivity cell offered a resistance of 60.5 ohms. What is the conductivity of 0.1 M AgNO3 solution?
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    272. Resistance of a conductivity cell filled with 0.1 M KCl solution is 100 £2. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 Ω. Calculate the conductivity and molar conductivity of 0.02 M KC1 solution. The conductivity of 0.1 M KCl at 298 K is 0.0129 s cm–1.
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    273. The electrical resistance of a column of 0.05 M NaOH solution of diameter 1 cm and length 50 cm is 5.55 x 103 ohm. Calculate its resistivity, conductivity and molar conductivity.
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    274. 250 cm3 solution containing 1 g of Ca(NO3)2 in conductivity cell offered a resistance of 48 ohms. The cell constant of conductivity of the solution is 0.56 cm-1. Find the molar conductivity.
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    275. The conductivity of 0.00241 M acetic acid is 7.896 x 10–5 s cm–1. Calculate its molar conductivity and if Λ°m for acetic acid is 390.5 s cm2 mol–1, what is its dissociation constant?
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    276. Λ°m for NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 s cm2 mol–1respectively. Calculate Λ° for HAC.
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    277. The specific conductance of a saturated solution of AgCl in water is 1.826 x 10–6ohm–1 cm–1 at 25°C. Calculate its solubility in water at 25°C. [Given Λ∞m (Ag+) = 61.92 ohm–1 cm2 mol–1 and Λ∞m (CI– ) = 76.34 ohm–1 cm2 mol–1]
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    278. Calculate the molar conductance at infinite dilution of ethanoic acid from the following data:
    Λ°m (HCl) = 425.9 s cm2 mol–1
    Λ°m (CH3COONa) = 91.0s cm2 mol–1
    Λ°m (NaCl) = 126.4 s cm2 mol–1

    Λ°m (CH3COOH) = λ°H+ + λ°CH3coo–
    = Λ°m(HCl) = λ°m (CH3COONa) – λ°NaCl
    = 425.9 + 91.0 –126.4
    = 390.5 s cm2 mol–1.

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    Multiple Choice QuestionsLong Answer Type

    279. Draw curves to show how the molar conductance of strong electrolytes varies with dilution.
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    Multiple Choice QuestionsShort Answer Type

    280. The molar conductivity of KCl solutions at different concentration at 298 K are given below:

    C/mol L–1

    Λ/s cm2 mol–1

    0.000198

    0.000309

    0.000521

    0.000989

    148.61

    148.29

    147.81

    147.09

     
    Show that a plot between A and C1/2 is a straight line. Determine the values of Λ° and Λ for KCl.
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