ChemCollective-Virtual-Labs/C3/Determination-of-Solubility-Product/English-timed
| Time | Narration |
| 00:01 | Welcome to this spoken tutorial on Determination of Solubility Product using Vlabs. |
| 00:08 | In this tutorial we will learn to, Determine Solubility of salts and
Calculate Solubility Product of various sparingly soluble salts. |
| 00:20 | Here, I am using
Mac OS version 10.10.5 |
| 00:26 | ChemCollective Vlabs version 2.1.0 and
Java version 8.0 |
| 00:34 | To follow this tutorial you should be familiar with,
Chemcollective vlabs interface. |
| 00:41 | If not for relevant tutorials, please visit our website. |
| 00:47 | Here, I have opened Virtual Chemistry labs application window. |
| 00:53 | Click on File menu and select Load Homework option.
Default Lab Setup dialog-box opens. |
| 01:02 | Double-click on Solubility and Solids option.
From the sub-menu, double-click on Determining the solubility product option. |
| 01:13 | A workbench opens with required chemicals and Problem Description. |
| 01:19 | Under the Stockroom Explorer double click on Problem Description. |
| 01:26 | Problem Description window opens. |
| 01:30 | The problem states that, using Virtual labs, We have to determine Solubility Products of
Silver chloride Strontium Sulphate Silver Carbonate and Strontium Iodate. |
| 01:47 | We have to also find the solubility of the above salts in Moles/Litre. |
| 01:54 | Finally we have to compare the Solubility and Solubility Products for pairs of salts. |
| 02:02 | Close the Problem Description window. |
| 02:05 | A substance's solubility product, is the mathematical product of its dissolved ion concentrations raised to the power of their stoichiometric coefficients. |
| 02:18 | For Example: Solubility of Silver Chloride in its saturated solution is given as follows: |
| 02:26 | For every one mole of silver chloride that dissolves, one mole of silver ion and one mole of chloride ion is produced. |
| 02:37 | Let us assign a variable S to represent solubility of Silver and Chloride ions. |
| 02:44 | Solubility Product of silver chloride is S squared. |
| 02:49 | Here is the solubility of Silver carbonate in its saturated solution. |
| 02:55 | Stoichiometric concentrations of the ions are in the ratio of 2 : 1 |
| 03:01 | In this equation, solubility of silver ion is two S and carbonate ion is S. |
| 03:09 | Solubility Product of silver carbonate is four S cube. |
| 03:15 | Significance of Solubility Product.
Solubility Product applies to solutions where salts do not fully dissolve. |
| 03:24 | Water is generally used as a solvent.
Solubility Product changes with temperature. |
| 03:32 | Solubility Product is a heterogeneous equilibrium constant. |
| 03:37 | The smaller the Solubility Product of a substance, the lower is its solubility. |
| 03:43 | Solubility Product values are useful in predicting, the precipitation in reactions. |
| 03:50 | When the Ionic product is greater than Solubility Product, then precipitation will occur. |
| 03:57 | When the Ionic product is smaller than Solubility Product, then precipitation will not occur. |
| 04:04 | Back to the workbench.
From the Stockroom Explorer, double-click to select, Silver chloride Silver Carbonate Strontium Sulphate and Strontium Iodate. |
| 04:22 | Click on Select tools icon.
Click to select Scale and Weighing Boat. |
| 04:29 | For this demonstration we require 4 copies of Weighing Boats. |
| 04:35 | Right-click on the Weighing Boat.
Select Duplicate option from the context menu. |
| 04:42 | A new Weighing Boat appears.
Similarly obtain other Weighing Boats. |
| 04:50 | Rearrange the Weighing Boats on the workbench. |
| 04:54 | Let us assign names to each one of them.
Right-click on the Weighing Boat. |
| 05:01 | Select Rename option from the context menu. |
| 05:05 | Rename the Weighing Boats as 1, 2, 3 and 4. |
| 05:15 | From the Stockroom Explorer, double-click on 100 mL Distilled water flask. |
| 05:22 | 100 mL Distilled water flask appears on the workbench.
Right-click on the flask. |
| 05:30 | Use Duplicate option to make 4 copies. |
| 05:36 | Rearrange 100 mL Distilled water flasks on the workbench. |
| 05:42 | Right-click on the flask, select Rename option from the context menu.
Rename the flasks as 1, 2, 3 and 4. |
| 05:58 | Bring the Scale to a convenient position on the workbench. |
| 06:03 | Place Weighing Boat 1 on the scale.
Click TARE. |
| 06:09 | Weigh 5 grams of Silver Chloride.
Bring the Silver Chloride bottle near to the Weighing Boat 1. |
| 06:17 | In the Transfer amount input bar , type 5.
Click on Pour. |
| 06:23 | Keep the Silver Chloride bottle aside.
Now let us transfer Silver Chloride to flask 1. |
| 06:31 | Bring Weighing Boat 1 to flask 1. |
| 06:34 | Type 5 in the Transfer amount input bar. Click on Pour.
Keep Weighing Boat aside. |
| 06:43 | Click on Flask 1.
Observe the Solution Info Panel. |
| 06:48 | By default Aqueous radio button is selected. |
| 06:53 | Concentrations of all the ionic species present in the solution are given here. |
| 07:00 | Click on the small black arrow, next to Molarity. |
| 07:04 | Here we can express concentrations in grams, moles and Molarity. |
| 07:12 | Note the concentrations of Silver ion and Chloride ion in terms of Molarity. |
| 07:18 | Similarly, using weighing boat, weigh 5 gm each of,
Silver Carbonate Strontium Sulphate, and Strontium Iodate |
| 07:32 | Pour into flasks 2, 3 and 4 respectively. |
| 07:57 | Click on each flask.
Wait till equilibrium is reached. |
| 08:05 | Note the concentrations of ions at equilibrium. |
| 08:09 | This value is the Solubility of that ion in its saturated solution. |
| 08:15 | Note solubility values for each ion in the table as shown here. |
| 08:22 | Calculate Solubility product for each salt.
Note in the table. |
| 08:28 | Solubility products values for Strontium salts are more when compared to silver salts. |
| 08:36 | This is because Strontium salts are more soluble in water when compared to silver salts. |
| 08:44 | The experimental values of Solubility Product are comparable with known values. |
| 08:52 | Let us summarize.
In this tutorial we have, Determined solubility of salts. |
| 09:00 | Calculated Solubility Product of various sparingly soluble salts. |
| 09:06 | As an assignment, For Strontium Sulphate and Strontium Iodate:
Write dissociation equation and Solubility Product expression. |
| 09:17 | Find Solubility Product of these salts at 35° C. |
| 09:23 | Observe whether dissolution of these salts is exothermic or endothermic. |
| 09:29 | The video at the following link summarizes the Spoken Tutorial project.
Please download and watch it. |
| 09:37 | The Spoken Tutorial Project team:
conducts workshops using spoken tutorials and gives certificates on passing online tests. |
| 09:47 | For more details, please write to us. |
| 09:50 | Please post your timed queries on this forum. |
| 09:54 | Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.
More information on this mission is available at this link. |
| 10:04 | This tutorial is contributed by Snehalatha Kaliappan and Madhuri Ganapathi from IIT-Bombay.
Thank you for joining. |
