how to plot graph of conductivity vs molar condutivity 

Asked by mangesh | 25th Jun, 2016, 01:04: PM

Expert Answer:

Dear mangeshchitnis007@gmail.com

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Do you mean graph of molar conductivity vs square root of concentration?
The molar conductivity of strong electrolyte vary with concentration according to the equation:
logical and subscript m superscript c space space equals space space logical and subscript m space space end subscript superscript degree minus space A square root of c
where A is a constant depending upon the type of the electrolyte, the nature of the solvent and the temperature, and logical and subscript m superscript degree is the molar conductivity at infinite dilution, called limiting molar conductivity.
(NaCl, BaCl2, MgSO4 are called 1-1, 2-1 and 2-2 electrolytes respectively depending upon the charges on cation and anion. For a given solvent and temeprature, all electrolytes of a particular type have the same value for the constant A.) 
The equation is called Debye Huckel-Onsager equation and is found to hold good at low concentrations. 
It can be seen that if we plot λm against c1/2, we obtain a straight line with intercept equal to  and slope equal to ‘–A’.
 
 
(Graph of Molar conductivity, λm versus c½ for acetic acid (weak electrolyte) and potassium chloride (strong electrolyte) in aqueous solutions.)
 
 
 
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Topperlearning Team.

Answered by Prachi Sawant | 27th Jun, 2016, 05:13: PM