ChemCollective-Virtual-Labs/C3/Metal-Displacement-Reactions/English-timed
| Time | Narration |
| 00:01 | Welcome to this spoken tutorial on Metal Displacement Reactions using Vlabs. |
| 00:07 | In this tutorial we will learn to, Carry out displacement reactions of,
Magnesium, Zinc, Lead, Copper and Silver |
| 00:20 | Arrange metals in decreasing order of reactivity. |
| 00:24 | To follow this tutorial you should be familiar with, ChemCollective Vlabs interface. |
| 00:31 | If not for relevant tutorials, please visit our website. |
| 00:37 | Here I am using
Mac OS version 10.10.5 ChemCollective Vlabs version 2.1.0 Java version 8. |
| 00:51 | Here I have opened Virtual Chemistry Labs application window.
Default lab setup window opens. |
| 01:01 | Click on File menu and select Load Homework option. |
| 01:06 | Default Lab Setup dialog box opens. |
| 01:10 | Double-Click on Redox Folder.
Then double-Click on Redox Reaction Series. |
| 01:18 | Click on Problem Description in the Stockroom Explorer. |
| 01:23 | The problem states that, Perform metal displacement reactions. |
| 01:29 | Arrange the given metals from strongest to weakest reducing agent. |
| 01:35 | Stockroom Explorer is provided with all the required metals and their salt solutions. |
| 01:43 | Let us define Redox Reactions.
An oxidation-reduction (redox) reaction, involves transfer of electrons between two species. |
| 01:54 | Oxidation is loss of electrons by any species.
Reduction is gain of electrons by any species. |
| 02:04 | Metal displacement reactions are a type of Redox reactions. |
| 02:09 | In metal displacement reactions, a more reactive metal displaces a less reactive metal in a metal salt solution. |
| 02:19 | This slide shows the activity series of some metals used in displacement reactions. |
| 02:27 | Here is an example of metal displacement reaction. |
| 02:32 | Silver ions in silver nitrate can be replaced by copper to form copper nitrate. |
| 02:39 | Elemental silver is precipitated in the reaction.
Silver has lower oxidation potential than copper. It cannot replace copper from copper nitrate. |
| 02:54 | Switch to application window
Click on Workbench1. |
| 03:00 | Right-click on the workbench tab to rename.
Type name as Magnesium-rxn (Magnesium reaction). |
| 03:08 | Let us now demonstrate the reactivity of Magnesium metal. |
| 03:13 | From the Stockroom Explorer, click on Solids cabinet, double-click on Magnesium. |
| 03:21 | Click on Solutions cabinet, double-click on,
0.1 M Copper nitrate 0.1 M Zinc Nitrate 0.1 M Lead Nitrate 0.2 M Silver Nitrate. |
| 03:37 | Close the cabinets. |
| 03:40 | Click on Glassware menu, and select 250 mL Erlenmeyer flask |
| 03:46 | We need 4 flasks for this experiment.
Make duplicates of the Erlenmeyer flask. |
| 03:55 | Rename the flasks with corresponding metal symbols, Zinc, Lead , Silver and Copper. |
| 04:06 | Arrange the apparatus and chemicals.
Click on any one of the bottles containing solution. |
| 04:14 | The Solution Info panel shows the bottle contains 50 ml of solution. |
| 04:21 | Pour the contents of the bottles into respective flasks using Precise transfer mode. |
| 04:28 | Type 50 in the Transfer amount input bar.
Click on Pour. |
| 04:35 | Similarly transfer contents of the bottles into flasks. |
| 04:44 | Keep the empty bottles aside. |
| 04:48 | Click on each Erlenmeyer flask and note the concentration of the metal ions. |
| 04:57 | Pour 1 gram of solid Magnesium metal in each flask using Precise transfer mode. |
| 05:11 | Click on the flask containing copper nitrate .
Observe that green color of the solution has disappeared. |
| 05:20 | Temperature increases on addition, then decreases.
The reaction is Exothermic. |
| 05:28 | In the Solution Info Panel, concentration of copper ions is zero. |
| 05:34 | Magnesium ions are observed in the solution.
This means that Magnesium has displaced copper ions from the solution. |
| 05:44 | Click on Solid radio button.
Observe that metallic copper is now deposited in the solution. |
| 05:52 | This is because Magnesium has higher oxidation potential than copper. |
| 05:58 | Click on the flask containing Zinc nitrate. |
| 06:02 | Click on Aqueous radio button on the Solution Info Panel.
Concentration of Zinc ions is zero. |
| 06:11 | Magnesium ions are now observed.
Click on Solid radio button. |
| 06:18 | Observe that Zinc is now found in the solution. |
| 06:22 | Magnesium has replaced Zinc ions from its solution. |
| 06:27 | Click on the flask containing lead nitrate.
Observe Solution Info panel. |
| 06:35 | Magnesium has replaced Lead ions from its solution. |
| 06:45 | Click on the flask containing silver nitrate.
Observe Solution Info panel. |
| 06:51 | Magnesium has replaced Silver ions from its solution. |
| 06:59 | Now let us demonstrate the activity of Zinc.
Click on File menu and select New Workbench. |
| 07:08 | Rename the workbench as Zinc-reaction. |
| 07:12 | From Solids cabinet select Zinc. |
| 07:16 | Click on Solutions cabinet and select
0.1 M Copper Nitrate 0.1 M Magnesium Nitrate 0.1 M Lead Nitrate 0.2 M Silver Nitrate |
| 07:30 | Close the cabinets. |
| 07:33 | As we did in the previous experiment, take 4 Erlenmeyer flasks. |
| 07:39 | Rename the flasks with corresponding metal symbols Magnesium, Lead, Copper and Silver.
Arrange the apparatus. |
| 07:53 | Pour the contents of the bottles into the respective flasks.
Type 50 in the Transfer amount input bar. Click on Pour. |
| 08:12 | Pour 1 g of solid Zinc metal in each flask. |
| 08:17 | Type 1 in the Transfer amount input bar.
Click on Pour. |
| 08:29 | Click on the flask containing copper nitrate. |
| 08:33 | Observe that Copper is displaced by Zinc. |
| 08:38 | Click on the flask containing Magnesium nitrate. |
| 08:42 | Zinc cannot replace Magnesium from the solution.
Because Zinc has lower oxidation potential than Magnesium. |
| 08:51 | Hence, there is no reaction and Zinc remains in the solution. |
| 08:57 | Similarly click on flasks containing Lead nitrate and Silver nitrate.
Observe that Zinc displaces both Lead and Silver. |
| 09:10 | Similarly perform the experiments for Lead, Copper and Silver.
Open a different workbench for each metal displacement reaction. |
| 09:23 | Rename the workbenches as Lead-reaction, Copper-reaction and Silver-reaction. |
| 09:31 | Required metals and salt solutions are available in the Stockroom Explorer. |
| 09:38 | We have performed these experiments. |
| 09:47 | Here are the observations. |
| 09:50 | We have tabulated the results as shown.
Magnesium has higher oxidation potential value. |
| 09:58 | Magnesium displaces metal ions, Zinc, lead, Copper and silver which have lower oxidation potentials. |
| 10:09 | Silver with lowest oxidation potential cannot displace,
Magnesium, zinc, lead or copper ions from solution. |
| 10:19 | The order of reactivity from strongest to weakest reducing agents is as follows. |
| 10:27 | Let us summarize
In this tutorial we have, Determined the order of reactivity for the following metals, Magnesium, Zinc, Lead, Copper and Silver. |
| 10:41 | As an assignment, Perform displacement reactions using solutions of metal halides. |
| 10:49 | Establish the order of reactivity of halogens. |
| 10:53 | The required chemicals are available in the Stockroom Explorer. |
| 10:58 | The video at the following link summarizes the Spoken Tutorial project.
Please download and watch it. |
| 11:05 | The Spoken Tutorial Project team, conducts workshops using spoken tutorials and
gives certificates on passing online tests. For more details, please write to us. |
| 11:17 | Please post your timed queries in this forum. |
| 11:21 | Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.
More information on this mission is available at this link. |
| 11:32 | This tutorial is contributed by Snehalatha Kaliappan and Madhuri Ganapathi from IIT-Bombay. Thank you for joining. |
