View source for ChemCollective-Virtual-Labs/C2/Preparation-of-Standard-Solutions/English-timed

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||'''Time''' 
||'''Narration''' 

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|| 00:01
|| Welcome to this spoken tutorial on Preparation of Standard Solutions. 

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||00:07
|| In this tutorial, we will learn to prepare standard solution of: 1 molar sodium chloride 

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||00:14
|| To follow this tutorial you should be familiar with, Higher secondary school Chemistry. 

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|| 00:21
|| Here I am using 

Mac OS version 10.10.5 

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|| 00:26
|| ChemCollective Vlabs version 2.1.0 

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|| 00:31
|| Java version 8.0 

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

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||00:41
|| Here I have opened '''Virtual Chemistry labs''' application window. 

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|| 00:46
|| We will begin by preparing standard solutions from solids. 

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|| 00:51
|| Go to '''File''' menu and select '''Load Homework''' option. 

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|| 00:56
|| '''Default Lab Setup '''dialog box opens. 

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|| 01:00
|| The dialog box lists a number of''' Local Problems.''' 

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

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|| 01:10
|| From the sub menu, double-click on '''Making solutions from solids'''. 

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|| 01:16
|| On the left panel,''' Stockroom explorer '''opens. 

It displays the required solutions and the '''problem description'''. 

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|| 01:26
|| Double-click on '''problem description''' icon. 

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|| 01:30
|| A '''problem description''' window opens next to the '''Workbench'''. 

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||01:35
||Window briefly describes list of problems you need to solve. 

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|| 01:40
|| Let's start with the first problem. 

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|| 01:43
|| We need to prepare 100 ml of 1 molar Sodium Chloride solution. 

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|| 01:49
|| Switch back to the '''Workbench''' by clicking on '''Workbench tab'''. 

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|| 01:54
|| On the right-side panel, '''Stockroom Explorer''' opens. 

It lists various chemicals to be used for this experiment. 

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|| 02:04
|| It has distilled water for making solutions. 

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|| 02:08
|| Some solids such as Sodium Chloride, Magnesium Chloride and Sodium Sulphate. 

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|| 02:15
|| Let us place the required chemicals and apparatus on the Workbench. 

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|| 02:20
|| Double-Click on Sodium chloride''' and ''' Distilled water '''icons'''. 

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|| 02:26
|| Sodium Chloride''' bottle and Distilled water are added to the '''Workbench'''. 

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|| 02:32
|| Click on '''Click to select tools from the drop down menu''', Click on '''Scale'''. 

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|| 02:39
|| '''Scale''' appears on the work '''bench'''. 

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|| 02:42
|| Go to '''Click to select new glassware from the drop down menu''' icon. 

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|| 02:48
|| Select '''Erlenmeyers'''. From the sub menu, select '''250 ml Erlenmeyer Flask'''. 

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|| 02:57
|| Go to '''Select new glassware ''' icon. 

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|| 03:00
|| Select '''Volumetrics'''. 

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|| 03:03
|| From the sub menu, select '''100ml Volumetric Flask'''. 

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|| 03:08
|| Again click on '''Select new glassware''' icon. 

Select '''Pipets'''. 

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|| 03:14
|| From the sub menu, select '''5ml Pipet'''. 

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||03:19
|| Molar mass of sodium chloride is 58.44 g/mol. 

Use the given formula to calculate Molarity. 

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|| 03:30
|| For 100ml of 1 M(molar) solution we need '''5.844 grams''' of '''Sodium Chloride'''. 

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|| 03:39
|| Back to the workbench. 

Drag the '''Scale''' to a convenient position on the Workbench. 

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|| 03:45
|| Click on '''Erlenmeyer Flask '''and drag on to the Scale. 

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|| 03:50
|| Release the mouse button after you see a green plus mark. 

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|| 03:55
|| Green plus mark indicates suitable position for placing the '''Erlenmeyer Flask'''. 

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|| 04:02
|| Release the mouse button, to place the '''Erlenmeyer Flask''' on the '''Scale'''. 

'''Scale''' shows '''mass''' of the '''Erlenmeyer Flask'''. 

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|| 04:11
|| Click on '''TARE''' button on the '''Scale'''. 

This step will reset the weight value to zero. 

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||04:18
|| '''Scale''' reads '''0 g(zero grams)'''. 

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||04:21
|| Click on '''Sodium Chloride''' bottle and move it over the '''Erlenmeyer Flask'''. 

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|| 04:27
|| Place the bottle in the correct position after it shows green '''plus mark'''. 

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|| 04:33
|| Type '''5.844''' in the '''Transfer amount''' text bar at the bottom of the '''Workbench.''' 

Click on '''Pour''' button. 

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|| 04:44
|| You can see that the '''Scale''' reads exactly '''5.844 grams'''. 

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|| 04:51
|| Click and drag Sodium Chloride bottle to a different place on the '''Workbench'''. 

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|| 04:57
|| Remove the '''Erlenmeyer Flask ''' and keep it aside. 

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|| 05:01
|| To remove the '''Scale''' from the '''Workbench''', Click on the '''Scale''' and press '''Delete'''. 

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||05:07
|| Drag the '''Distilled water''' on to the '''250ml Erlenmeyer Flask'''. 

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|| 05:12
|| Type 90 in the '''Transfer bar''' below. 

Click on '''Pour'''. 

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|| 05:18
|| This will transfer 90 ml of distilled water into the Flask. 

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|| 05:23
|| Drag and place the distilled water to a corner of the '''Workbench'''. 

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||05:28
|| Place the '''volumetric flask''' next to '''Erlenmeyer flask'''. 

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|| 05:33
|| Click and drag the '''Erlenmeyer''' on to 100ml Volumetric Flask. 

Make sure that '''green plus mark''' appears. 

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|| 05:42
|| To transfer the contents of the Flask, use '''Realistic Transfer''' option. 

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|| 05:47
|| Click on '''Tools''' menu. 

Scroll down and click on '''Transfer Bar'''. 

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|| 05:53
|| From the sub menu click on '''Realistic Transfer''' radio button. 

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|| 05:58
|| '''Realistic transfer Scale''' appears at the bottom of the Workbench. 

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||06:03
|| Click on '''Pour''' button. 

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

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|| 06:12
|| To wash the '''Erlenmeyer Flask''' with distilled water; Place the water tank over the '''Erlenmeyer Flask '''and transfer 5ml distilled water. 

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|| 06:23
|| Change the '''Transfer Bar''' to '''Precise''' '''Transfer''' using '''Tools''' menu. 

Type 5 in the Transfer bar below. 

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|| 06:30
|| Click on '''Pour '''button. 

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|| 06:34
|| Now pour the contents of the '''Erlenmeyer Flask''' into the '''Volumetric Flask'''. 

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|| 06:40
|| To transfer the contents of the Flask, use '''Realistic Transfer '''option'''.''' 

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|| 06:48
|| Click on '''Pour '''button. 

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

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|| 06:58
|| Change the transfer mode to '''Precise Transfer'''. 

Place the distilled water above the '''Erlenmeyer Flask'''. 
 
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|| 07:07
|| Transfer 5 ml distilled water into '''Erlenmeyer Flask'''. 

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|| 07:13
|| Type 5 in the '''Transfer amount''' text bar and click on '''Pour'''. 

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|| 07:19
|| Move the distilled water to a corner of the Workbench. 

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|| 07:23
|| Move the 5 ml '''Pipet''' onto Erlenmeyer Flask. 

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|| 07:28
|| Type 5 in the '''Transfer amount''' text bar and click on '''Withdraw'''. 

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|| 07:34
|| 5 ml of water is withdrawn into the Pipet. 

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||07:39
|| Drag the Pipet onto '''100 mL Volumetric Flask.''' 

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|| 07:44
|| Change the transfer mode to '''Realistic Transfer '''using''' Tools '''menu. 

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|| 07:49
|| Click on '''Pour''' button gradually so as to make up to the mark. 

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|| 07:55
|| For colourless solutions, the lower meniscus must be on the 100 ml mark. 

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|| 08:03
|| Click on the standard Flask. 

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

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|| 08:14
|| Click on the standard Flask. 

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

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|| 08:24
|| Observe that the concentration of '''sodium cation''' is approximately '''1.0 molar'''. 

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|| 08:30
|| Go back to Problem description window. 

Similarly you can also try some of these problems. 

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||08:39
|| Let us summarize. 

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

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|| 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. 
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