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Question
Write three important steps required to determine molar conductivity.
Solution
- Determination of cell constant:
Cell constant is determined by using KCl solution of known concentration in the conductivity cell. The resistance of this KCl solution is measured by Wheatstone bridge.
Now, cell constant = `"k"_"KCl" xx "R"_"solution"`
Conductivity of KCl solution is known. Thus, cell constant is calculated. - Determination of conductivity of given solution:
KCl solution in the conductivity cell in step (1) is replaced by the given solution whose conductivity is to be measured. Its resistance is measured by the Wheatstone bridge. The conductivity of given solution is then calculated as:
k = `"Cell constant"/("R"_("solution"))` - Calculation of molar conductivity:
The molar conductivity of the given solution is then calculated using equation:
Λ = `(1000"k")/"c"`
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