Conductance Of Electrolytic Solutions
Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_05_03 |
Topic Name : Conductance Of Electrolytic Solutions |
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Sub Topic Name : Variation Of Conductivity And Molar Conductivity With Concentration |
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Introduction
• Conductivity always decreases with decrease in concentration both, for weak and strong electrolytes. • This can be explained by the fact that the number of ions per unit volume that carry the current in a solution decreases on dilution.
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, sugar solution, 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 sugar solution 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 | A salt solution conducts electricity. |
What you learn in Theory:
Conductivity always decreases with decrease in concentration both, for weak and strong electrolytes.
What you learn in Practice:
Diluted solution has low conductivity.