Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_05_06 |
Topic Name : Conductance Of Electrolytic Solutions |
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Sub Topic Name : Kohlrausch's Law And Applications |
• Kohlrausch gave the law of independent migration of ions. The law states that limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte. • Using Kohlrausch law of independent migration of ions, it is possible to calculate Ëm°, molar conductivity for any electrolyte.
Electrochemical cell, electrolyte (strong and weak), conductivity, molar conductivity, limiting molar conductivity.
Salt solution conducts electricity as it forms a large number of ions in solution in water. Salts are therefore necessary for the human body as well.
Why does salt solution conduct electricity but a vinegar solution does not?
Key Words | Definitions (pref. in our own words) |
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Electrolyte | Electrolyte is a solution which conducts electricity. |
Gadgets | How it can be used |
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Salt water, vinegar, bulb with a circuit | Dip a circuit bulb in a salt solution and then in normal water. Notice the intensity of the light in the bulb. Now dip the circuit bulb attached to a battery in vinegar and compare it with the intensity of the light bulb with that in salt solution. |
Conductivity of ionic solutions such as important salt, are important for the human body.
Garage, switchboard
Examples | Explainations |
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Salt solution, vinegar | A salt solution conducts electricity while vinegar, a diluted form of acetic acid does not as it is a weak electrolyte. |
Using Kohlrausch law of independent migration of ions, it is possible to calculate Ëm° for any electrolyte from the ?o of individual ions.
For weak electrolytes like acetic acid it is possible to determine the value of its dissociation constant, K, once we know the Ëm° and ?m at a given concentration c.
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