ExpEYES/C2/Conductivity-of-ionic-solutions/English-timed
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| Time | Narration |
| 00:01 | Hello everyone. Welcome to this tutorial on Conductivity of ionic solutions. |
| 00:07 | In this tutorial, we will learnt to:
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| 00:15 | Here, I am using:
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| 00:23 | To follow this tutorial, you should be familiar with ExpEYES Junior interface.
If not, for relevant tutorials, please visit our website. |
| 00:35 | Let's first define conductivity of a solution. |
| 00:38 | Conductivity of a solution is a measure of its ability to conduct electricity. |
| 00:44 | Conductivity of water is directly related to the concentration of ions dissolved in it. |
| 00:51 | Now we will demonstrate conductivity of tap water. |
| 00:56 | I will explain the circuit connections. A1 is connected to SINE. |
| 01:02 | Wires from SINE and A2 are dipped in glass tumbler containing tap water. |
| 01:08 | A 10K resistor is connected between A2 and GND. This is the circuit diagram. |
| 01:16 | Let's see the result on the Plot window. |
| 01:20 | On the Plot window, click on A1 and drag to CH1. A1 is assigned to CH1. |
| 01:28 | Click on A2 and drag to CH2.
A2 is assigned to CH2. |
| 01:35 | Move the mSec/div slider to adjust the waves. Two sine waves are generated. |
| 01:43 | Black trace is the original sine wave. Red trace is conductivity of tap water. |
| 01:50 | Click on CH1 and drag to FIT. Click on CH2 and drag to FIT. |
| 01:56 | 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. |
| 02:08 | Right click on CH1 to see voltages and Phase difference in degree. |
| 02:15 | 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. |
| 02:27 | In the same connection, wires from SINE and A2 are dipped in copper sulphate solution. |
| 02:34 | On the Plot window we can see the conductivity curve. |
| 02:38 | Red trace is conductivity of copper sulphate solution. |
| 02:42 | Increased conductivity is due to copper and sulphate ions present in the solution. |
| 02:48 | Observe the voltage and frequency values on the right. |
| 02:52 | Right click on CH1 to see voltages and Phase difference values. |
| 02:59 | Now, we will measure conductivity of dilute sulphuric acid solution. A few drops of dilute sulphuric acid are added to water. |
| 03:09 | Wires are dipped in sulphuric acid solution. Let's see the result on the Plot window. |
| 03:17 | Observe that black and red traces are almost coinciding with each other. |
| 03:23 | Conductivity of tap water has increased on adding a few drops of dilute sulphuric acid. |
| 03:30 | Observe the voltage and frequency values on the right. |
| 03:34 | Right click on CH1 to see voltages and Phase difference in degree. |
| 03:41 | We will measure conductivity of dilute Potassium hydroxide solution. A few drops of dilute Potassium hydroxide solution are added to tap water. |
| 03:52 | We can see that black and red traces are almost coinciding with each other. |
| 03:58 | Notice the increased conductivity of tap water on adding a few drops of Potassium hydroxide solution. |
| 04:05 | Observe the voltage and frequency values on the right side of the window. |
| 04:11 | Right click on CH1 to see voltages and Phase difference in degree. |
| 04:18 | Using the voltage values we have calculated the resistance of ionic solutions and tabulated the results. |
| 04:27 | Resistance value for tap water is 7.7 KOhm (kilo ohm).
Resistance value for copper sulphate solution is 1.2 KOhm. |
| 04:38 | Sulphuric acid solution is 0.17 KOhm and potassium hydroxide solution is 0.14 KOhm.
Notice that resistance values decreased with the increase in ionic concentration. |
| 04:55 | Let's summarize. |
| 04:57 | In this tutorial, we have learnt to:
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| 05:06 | As an assignment,
calculate the resistance of ionic solutions. |
| 05:18 | This video summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it. |
| 05:26 | We conduct workshops using Spoken Tutorials and give certificates. Please contact us. |
| 05:32 | The Spoken Tutorial Project is funded by NMEICT, MHRD Government of India. |
| 05:39 | This tutorial is contributed by Kaushik Datta and Madhuri Ganapathi.
Thank you for joining. |
