Conductance Of Electrolytic Solutions
Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_05_04 |
Topic Name : Conductance Of Electrolytic Solutions |
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Sub Topic Name : Strong Electrolytes |
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Introduction
• The strong electrolytes have high molar conductivities, and their conductivities change very little if the solution is diluted. • 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.
Pre-Requisites:
Electrochemical cell, electrolyte, conductivity, molar conductivity
Activity:
Salt solution conducts electricity as it forms an ionic solution in water. Salts are therefore necessary for the human body as well.
Real Life Question:
Why does salt solution conduct electricity but a sugar solution does not?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Electrolyte | Electrolyte is a solution which conducts electricity. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| 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. |
Real life uses :
Conductivity of ionic solutions such as important salt, are important for the human body.
Places to visit :
Garage, switchboard
Practical examples around us
| Examples | Explainations |
|---|---|
| Salt solution, vinegar | A salt solution conducts electricity while vinegar does not as it is a weak electrolyte. |
What you learn in Theory:
• The strong electrolytes have high molar conductivities, and their conductivities change very little if the solution is diluted.
What you learn in Practice:
Diluted solution has low conductivity; Strong electrolytes have strong electrical conductivity due to the higher number of cations and anions in solutions.