Question

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.

17 Jun 2017
Answer :
Word Count : 525

Molar conductivity and limited molar conductivity are important concepts in electro-analytical chemistry, specifically in the context of studying the conductance of electrolyte solutions. These terms help us understand the conductance properties of electrolytes and provide valuable information about their dissociation or ionization behavior.

1. Molar Conductivity (Λm): Molar conductivity is a measure of the ability of a substance to conduct an electric current in solution. It is defined as the conductivity of a solution of the substance divided by the concentration of the substance in moles per unit volume. In mathematical terms, molar conductivity (Λm) can be expressed as:

   Λm = κ / c

   Where:
   - Λm is the molar conductivity in S m² mol⁻¹.
   - κ is the conductivity of the solution in S

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