IGNOU MCH 4 2017 - How the conductance is varies with concentration? Explain with the hel

Question

How the conductance is varies with concentration? Explain with the help of suitable examples.

08 Mar 2018

Answer :

Word Count : 526

Specific conductivity or conductivity of an electrolytic solution at any given concentration is the conductance of unit volume of solution kept between two platinum electrodes with unit area of cross section and at a distance of unit length. Conductivity decreases with decrease in concentration as the number of ions per unit volume that carry the current in a solution decrease on dilution. Molar conductivity of a solution at a given concentration is the conductance of the volume V of solution containing one mole of electrolyte kept between two electrodes with area of cross section A and distance of unit length.

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Here,

c = concentration in moles per volume
Ðš = specific conductivity
É…_m = molar conductivity.

As the solution contains only one mole of electrolyte, the above equation can be modified as:

É…_m = ÐšV

Molar conductivity increases with decrease in concentration as the total volume, V, of solution containing one mole of electrolyte also increases. Upon dilution the concentration decreases. When the concentration approaches zero, molar conductivity

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