ExpEYES/C2/Conductivity-of-ionic-solutions/English
| Visual Cue | Narration |
| Slide Number 1
Title Slide |
Hello everyone.
Welcome to this tutorial on Conductivity of ionic solutions. |
| Slide Number 2
Learning Objectives
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In this tutorial we will learnt to:
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| Slide Number 3
System Requirement
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Here I am using,
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| Slide Number 4
Pre-requisties You should be familiar with: ExpEYES interface. For relevant tutorials, visit our website. www.spoken-tutorial.org. |
To follow this tutorial, you should be familiar with:
ExpEYES Junior interface. If not, for relevant tutorials, please visit our website. |
| Let's first define conductivity of a solution. | |
| Slide Number 5
Electrical Conductivity |
Conductivity of a solution is a measure of its ability to conduct electricity.
Conductivity of water is directly related to the concentration of ions dissolved in it. |
| Slide Number 6
Demonstrate conductivity of tap water. |
Now we will demonstrate conductivity of tap water. |
| Show the picture.
Show the circuit diagram. |
I will explain the circuit connections.
A1 is connected to SINE. Wires from SINE and A2 are dipped in glass tumbler containing tap water. 10K resistor is connected between A2 and GND. This is the circuit diagram. |
| Let's see the result on the Plot window. | |
| Click on A1 and drag to CH1.
Point to assigned value. |
On the Plot window, click on A1 and drag to CH1.
A1 is assigned to CH1. |
| Click on A2, drag to CH2.
Point to assigned value. |
Click on A2, drag to CH2.
A2 is assigned to CH2. |
| Move the mSec/div slider.
Point to the waves. |
Move the mSec/div slider to adjust the waves.
Two sine waves are generated. |
| Point to the black trace.
Point to the red trace. |
Black trace is the original sine wave.
Red trace is conductivity of tap water. |
| Click on CH1, drag to FIT.
Click on CH2, drag to FIT. Point to voltage and frequency values. |
Click on CH1 and drag to FIT.
Click on CH2 and drag to FIT. Observe the voltage and frequency values on the right side of the window. Notice that voltage of tap water is very less compared to the input voltage. |
| Right click on 'CH1. | Right click on CH1 to see voltages and Phase difference in degree. |
| Slide Number 7
Conductivity Measure conductivity of copper sulphate solution. One spatula of copper sulphate is dissolved in 100 ml of water. |
Now we will measure conductivity of copper sulphate solution.
To make the solution one spatula of copper sulphate is dissolved in 100 ml of water. |
| Show the picture. | In the same connection,
wires from SINE and A2 are dipped in copper sulphate solution. |
| Point to the Plot window. | On the Plot window we can see the conductivity curve. |
| Point to the black trace.
Point to the red trace. |
Red trace is conductivity of copper sulphate solution.
Increased conductivity of is due to copper and sulphate ions present in the solution. |
| Point to voltage and frequency values. | Observe the voltage and frequency values on the right. |
| Right click on CH1 | Right click on CH1 to see voltages and Phase difference values. |
| Slide Number 8
Conductivity Measure conductivity of dilute sulphuric acid solution. A few drops of dilute sulphuric acid are added to water. |
Now we will measure conductivity of dilute sulphuric acid solution.
A few drops of dilute sulphuric acid are added to water. |
| Show the picture. | Wires are dipped in sulphuric acid solution. |
| Let's see the result on the Plot window. | |
| Point to the trace. | Observe that black and red traces are almost coinciding with each other.
Conductivity of tap water has increased: on adding a few drops of dilute sulphuric acid. |
| Point to voltage and frequency values. | Observe the voltage and frequency values on the right. |
| Right click on CH1. | Right click on CH1 to see voltages and Phase difference in degree. |
| Slide Number 9
Conductivity Measure conductivity of dilute Potassium hydroxide solution. A few drops of dilute Potassium hydroxide solution are added to water. |
We will measure conductivity of dilute Potassium hydroxide solution.
A few drops of dilute Potassium hydroxide solution are added to tap water. |
| Point to the trace. | We can see that black and red traces are almost coinciding with each other.
Notice the increased conductivity of: tap water on adding a few drops of Potassium hydroxide solution. |
| Point to voltage and frequency values. | Observe the voltage and frequency values on the right side of the window. |
| Right click on CH1 | Right click on CH1 to see voltages and Phase difference in degree. |
| Show the table. | Using the voltage values we have calculated the resistance of ionic solutions and tabulated the results.
Resistance value for tap water is 7.7 KOhm Resistance value for:
Notice that resistance values decreased with the increase in ionic concentration. |
| Let's summarize. | |
| Slide Number 10
Summary We have learnt to:
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In this tutorial we have learnt to:
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| Slide Number 11
Assignment
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As an assignment,
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| Slide Number 12
Acknowledgement Watch the video available at: http://spoken-tutorial.org/What is a Spoken Tutorial. It summarises the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it. |
This video summarises the Spoken Tutorial project.
If you do not have good bandwidth, you can download and watch it. |
| Slide Number 13
The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to, contact@spoken-tutorial.org. |
We conduct workshops using Spoken Tutorials and give certificates.
Please contact us. |
| Spoken Tutorial Project is a part of the Talk to a Teacher project
It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at: |
The Spoken Tutorial Project is funded by NMEICT, MHRD Government of India. |
| This tutorial is contributed by Kaushik Datta and Madhuri Ganapathi. Thank you for joining. |
