Difference between revisions of "ChemCollective-Virtual-Labs/C2/Preparation-of-Standard-Solutions/English-timed"

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|| The dialogue box lists a number of''' Local Problems.'''  
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From the list, double-click to select '''Molarity and Density'''.  
 
From the list, double-click to select '''Molarity and Density'''.  

Latest revision as of 16:05, 28 October 2020

Time Narration
00:01 Welcome to this spoken tutorial on Preparation of Standard Solutions.
00:07 In this tutorial, we will learn to prepare standard solution of: 1 molar sodium chloride
00:14 To follow this tutorial you should be familiar with, Higher secondary school Chemistry.
00:21 Here I am using

Mac OS version 10.10.5

00:26 ChemCollective Vlabs version 2.1.0
00:31 Java version 8.0

To run this application smoothly, please install latest version of Java.

00:41 Here I have opened Virtual Chemistry labs application window.
00:46 We will begin by preparing standard solutions from solids.
00:51 Go to File menu and select Load Homework option.
00:56 Default Lab Setup dialog box opens.
01:00 The dialog box lists a number of Local Problems.

From the list, double-click to select Molarity and Density.

01:10 From the sub menu, double-click on Making solutions from solids.
01:16 On the left panel, Stockroom explorer opens.

It displays the required solutions and the problem description.

01:26 Double-click on problem description icon.
01:30 A problem description window opens next to the Workbench.
01:35 Window briefly describes list of problems you need to solve.
01:40 Let's start with the first problem.
01:43 We need to prepare 100 ml of 1 molar Sodium Chloride solution.
01:49 Switch back to the Workbench by clicking on Workbench tab.
01:54 On the right-side panel, Stockroom Explorer opens.

It lists various chemicals to be used for this experiment.

02:04 It has distilled water for making solutions.
02:08 Some solids such as Sodium Chloride, Magnesium Chloride and Sodium Sulphate.
02:15 Let us place the required chemicals and apparatus on the Workbench.
02:20 Double-Click on Sodium chloride and Distilled water icons.
02:26 Sodium Chloride bottle and Distilled water are added to the Workbench.
02:32 Click on Click to select tools from the drop down menu, Click on Scale.
02:39 Scale appears on the work bench.
02:42 Go to Click to select new glassware from the drop down menu icon.
02:48 Select Erlenmeyers. From the sub menu, select 250 ml Erlenmeyer Flask.
02:57 Go to Select new glassware icon.
03:00 Select Volumetrics.
03:03 From the sub menu, select 100ml Volumetric Flask.
03:08 Again click on Select new glassware icon.

Select Pipets.

03:14 From the sub menu, select 5ml Pipet.
03:19 Molar mass of sodium chloride is 58.44 g/mol.

Use the given formula to calculate Molarity.

03:30 For 100ml of 1 M(molar) solution we need 5.844 grams of Sodium Chloride.
03:39 Back to the workbench.

Drag the Scale to a convenient position on the Workbench.

03:45 Click on Erlenmeyer Flask and drag on to the Scale.
03:50 Release the mouse button after you see a green plus mark.
03:55 Green plus mark indicates suitable position for placing the Erlenmeyer Flask.
04:02 Release the mouse button, to place the Erlenmeyer Flask on the Scale.

Scale shows mass of the Erlenmeyer Flask.

04:11 Click on TARE button on the Scale.

This step will reset the weight value to zero.

04:18 Scale reads 0 g(zero grams).
04:21 Click on Sodium Chloride bottle and move it over the Erlenmeyer Flask.
04:27 Place the bottle in the correct position after it shows green plus mark.
04:33 Type 5.844 in the Transfer amount text bar at the bottom of the Workbench.

Click on Pour button.

04:44 You can see that the Scale reads exactly 5.844 grams.
04:51 Click and drag Sodium Chloride bottle to a different place on the Workbench.
04:57 Remove the Erlenmeyer Flask and keep it aside.
05:01 To remove the Scale from the Workbench, Click on the Scale and press Delete.
05:07 Drag the Distilled water on to the 250ml Erlenmeyer Flask.
05:12 Type 90 in the Transfer bar below.

Click on Pour.

05:18 This will transfer 90 ml of distilled water into the Flask.
05:23 Drag and place the distilled water to a corner of the Workbench.
05:28 Place the volumetric flask next to Erlenmeyer flask.
05:33 Click and drag the Erlenmeyer on to 100ml Volumetric Flask.

Make sure that green plus mark appears.

05:42 To transfer the contents of the Flask, use Realistic Transfer option.
05:47 Click on Tools menu.

Scroll down and click on Transfer Bar.

05:53 From the sub menu click on Realistic Transfer radio button.
05:58 Realistic transfer Scale appears at the bottom of the Workbench.
06:03 Click on Pour button.

Hold the left mouse button until entire amount has been transferred to the Flask.

06:12 To wash the Erlenmeyer Flask with distilled water; Place the water tank over the Erlenmeyer Flask and transfer 5ml distilled water.
06:23 Change the Transfer Bar to Precise Transfer using Tools menu.

Type 5 in the Transfer bar below.

06:30 Click on Pour button.
06:34 Now pour the contents of the Erlenmeyer Flask into the Volumetric Flask.
06:40 To transfer the contents of the Flask, use Realistic Transfer option.
06:48 Click on Pour button.

Hold the left mouse button until entire amount has been transferred to the Flask.

06:58 Change the transfer mode to Precise Transfer.

Place the distilled water above the Erlenmeyer Flask.

07:07 Transfer 5 ml distilled water into Erlenmeyer Flask.
07:13 Type 5 in the Transfer amount text bar and click on Pour.
07:19 Move the distilled water to a corner of the Workbench.
07:23 Move the 5 ml Pipet onto Erlenmeyer Flask.
07:28 Type 5 in the Transfer amount text bar and click on Withdraw.
07:34 5 ml of water is withdrawn into the Pipet.
07:39 Drag the Pipet onto 100 mL Volumetric Flask.
07:44 Change the transfer mode to Realistic Transfer using Tools menu.
07:49 Click on Pour button gradually so as to make up to the mark.
07:55 For colourless solutions, the lower meniscus must be on the 100 ml mark.
08:03 Click on the standard Flask.

We now have 100 mL of sodium chloride(NaCl) solution as indicated in the Solution info panel.

08:14 Click on the standard Flask.

Solution Info Panel on the right displays the Species and the corresponding Molarity.

08:24 Observe that the concentration of sodium cation is approximately 1.0 molar.
08:30 Go back to Problem description window.

Similarly you can also try some of these problems.

08:39 Let us summarize.

In this tutorial we have learnt to prepare, 100 ml of 1 molar sodium chloride solution.

08:48 As an assignment, Prepare the following standard solutions.

250 ml of 5 molar sodium chloride solution

500 ml of 10 normal Magnesium chloride solution.

09:02 The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

09:11 The Spoken Tutorial Project team, conducts workshops using spoken tutorials and

gives certificates on passing online tests.

For more details, please write to us.

09:23 Do you have questions in THIS Spoken Tutorial?

Please visit this site . Choose the minute and second where you have the question.

09:32 Explain your question briefly . Someone from our team will answer them.
09:38 The Spoken Tutorial forum is for specific questions on this tutorial

Please do not post unrelated and general questions on them

09:47 This will help reduce the clutter

With less clutter, we can use this discussions as instructional material.

09:56 Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

10:07 This tutorial is contributed by Snehalatha Kaliappan and Madhuri Ganapathi from IIT-Bombay.

Thank you for joining.

Contributors and Content Editors

PoojaMoolya