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KVPY Sample Paper KVPY Stream-SX Model Paper-26

  • question_answer
    Molar conductivity of aqueous solution of sodium stearate, which behaves as a strong electrolyte is recorded at varying concentration [C] of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution? (Critical micelle concentration (CMC) is marked with an arrow in the figures)

    A)

    B)

    C)  

    D)

    Correct Answer: D

    Solution :

    Sodium stearate at low concentration (i.e., below CMC) behaves as normal strong electrolyte, but at higher concetration (i.e., above CMC) exhibits colloidal behaviour due to the formation of micelles. Thus, plot [d] correctly represents relation between \[\hat{\ }m\] and \[\sqrt{C}\] for sodium strearate.


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