| 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. |
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Molar conductivity and limited molar conductivity are important concepts in electro-analytical chemistry. They are used to describe the conductance of a solution and can be applied to determine dissociation constants for weak electrolytes like ethanoic acid.
1. Molar Conductivity (Λm): Molar conductivity is a measure of the ability of a solution of an electrolyte to carry an electric current. It is defined as the conductivity of a solution containing 1 mole of the electrolyte dissolved in it. The unit of molar conductivity is S m² mol⁻¹. Mathematically, molar conductivity is represented as Λm = κ * V, where κ is the conductivity of the solution in Siemens per meter (S/m), and V is the volume of the solution in liters containing 1 mole of the electrolyte.
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