ChemCollective-Virtual-Labs/C2/Preparation-of-Standard-Solutions/English

Visual Cue	Narration
Slide Number 1 Title Slide	Welcome to this spoken tutorial on Preparation of Standard Solutions.
Slide Number 2 Learning Objectives To prepare standard solution.	In this tutorial, we will learn to prepare standard solution of: 1 molar sodium chloride
Slide Number 3 Pre-requisites	To follow this tutorial you should be familiar with, Higher secondary school Chemistry.
Slide Number 4 System Requirement	Here I am using Mac OS version 10.10.5 ChemCollective Vlabs version 2.1.0 Java version 8.0 To run this application smoothly, please install latest version of Java.
Point to the window.	Here I have opened Virtual Chemistry labs application window.
Cursor on the Workbench	We will begin by preparing standard solutions from solids.
Go to File menu and click on Load homework option.	Go to File menu and select Load Homework option.
A dialog box opens.	Default Lab Setup dialog box opens.
The dialog box lists a number of local problems. Select Molarity and Density	The dialog box lists a number of Local Problems. From the list, double-click to select Molarity and Density.
Sub menu >> double click on Making solutions from solids	From the sub menu, double-click on Making solutions from solids.
Cursor on the stockroom explorer	On the left panel, Stockroom explorer opens. It displays the required solutions and the problem description.
Click on problem description.	Double-click on problem description icon.
A problem description window opens.	A problem description window opens next to the Workbench.
Hover the mouse on the window.	Window briefly describes list of problems you need to solve.
Cursor on the window.	Let's start with the first problem.
Highlight the sentence.	We need to prepare 100 ml of 1 molar Sodium Chloride solution.
Click on Workbench	Switch back to the Workbench by clicking on Workbench tab.
Cursor on Stockroom explorer.	On the right-side panel, Stockroom Explorer opens. It lists various chemicals to be used for this experiment.
Cursor on Stockroom explorer.	It has distilled water for making solutions. Some solids such as Sodium Chloride, Magnesium Chloride and Sodium Sulphate.
Cursor on workbench.	Let us place the required chemicals and apparatus on the Workbench.
Cursor on Stockroom explorer.	Double-Click on Sodium chloride and Distilled water icons. Sodium Chloride bottle and Distilled water are added to the Workbench.
Click on Click to select the tools from the drop down menu option on Workbench.	Click on Click to select tools from the drop down menu.
Click on Scale Cursor on the Workbench	Click on Scale. Scale appears on the work bench.
Go to Click to select new glassware from the drop down menu icon Select Erlenmeyers. A sub menu appears. Click on 250 ml Erlenmeyer Flask. Point to the Erlenmeyer.	Go to Click to select new glassware from the drop down menu icon. Select Erlenmeyers, From the sub menu, select 250 ml Erlenmeyer Flask.
Go to Click to select new glassware from the drop down menu Select Volumetrics. A sub menu appears. Click on 100ml Volumetric Flask.	Go to Select new glassware icon. Select Volumetrics. From the sub menu, select 100ml Volumetric Flask.
Go on Click to select new glassware from the drop down menu. Select Pipet. A sub menu appears. Click on 10ml Pipet.	Again click on Select new glassware icon. Select Pipets. From the sub menu, select 5ml Pipet.
Slide number 5 Calculation molar mass of sodium chloride = 58.44g/mol. Formula: M = Wt/Molar mass X 1000/ mL 1.0= Wt/58.44 x1000/100 Wt= 5.844g	Molar mass of sodium chloride is 58.44 g/mol. Use the given formula to calculate Molarity. For 100ml of 1 M(molar) solution we need 5.844 grams of Sodium Chloride.
Click on the Erlenmeyer Flaskand drag.	Back to the workbench. Drag the Scale to a convenient position on the Workbench. Click on Erlenmeyer Flask and drag on to the Scale. Release the mouse button after you see a green plus mark.
Point to the weight given on the Scale.	Green plus mark indicates suitable position for placing the Erlenmeyer Flask. Release the mouse button, to place the Erlenmeyer Flask on the Scale. Scale shows mass of the Erlenmeyer Flask.
Click on Tare button on the Scale	Click on TARE button on the Scale. This step will reset the weight value to zero.
Point to Scale.	Scale reads 0 g(zero grams).
Click on NaCl bottle and move	Click on Sodium Chloride bottle and move it over the Erlenmeyer Flask. Place the bottle in the correct position after it shows green plus mark.
Type 0.5844 in Transfer amount(g) text bar >> click on Pour.	Type 5.844 in the Transfer amount text bar at the bottom of the Workbench. Click on Pour button.
Point to Scale	You can see that the Scale reads exactly 5.844 grams.
Click >> drag the NaCl bottle	Click and drag Sodium Chloride bottle to a different place on the Workbench.
Click, drag Erlenmeyer Flask >> place it on Workbench.	Remove the Erlenmeyer Flask and keep it aside.
Click on the Scale, press Backspace.	To remove the Scale from the Workbench, Click on the Scale and press Delete.
Drag Distilled water' on 250ml Erlenmeyer Flask.	Drag the Distilled water on to the 250ml Erlenmeyer Flask.
Type 90 in Transfer bar below.	Type 90 in the Transfer bar below. Click on Pour. This will transfer 90 ml of distilled water into the Flask.
Drag, place distilled water to a corner of the Workbench.	Drag and place the distilled water to a corner of the Workbench.
Drag volumetric flask next to Erlenmeyer flask.	Place the volumetric flask next to Erlenmeyer flask.
Click, drag the Erlenmeyer on to the 100ml Flask.	Click and drag the Erlenmeyer on to 100ml Volumetric Flask. Make sure that green plus mark appears. To transfer the contents of the Flask, use Realistic Transfer option.
Click on Tools menu. Scroll down >> click on Transfer. A sub menu appears. Click on 'Realistic Transfer.	Click on Tools menu. Scroll down and click on Transfer Bar. From the sub menu click on Realistic Transfer radio button.
Cursor on Realistic transfer Scale.	Realistic transfer Scale appears at the bottom of the Workbench.
Hold down the mouse button on Pour.	Click on Pour button. Hold the left mouse button until entire amount has been transferred to the Flask.
Place the water tank over Erlenmeyer Flask.	To wash the Erlenmeyer Flask with distilled water; Place the water tank over the Erlenmeyer Flask and transfer 5ml distilled water.
Type 5 in the realistic transfer bar. Click on pour.	Change the Transfer Bar to Precise Transfer using Tools menu. Type 5 in the Transfer bar below. Click on Pour button.
Cursor on the Workbench.	Now pour the contents of the Erlenmeyer Flask into the Volumetric Flask. To transfer the contents of the Flask, use Realistic Transfer option.
Click on Pour button. Hold the left mouse button until entire amount has been transferred to the Flask.	Click on Pour button. Hold the left mouse button until entire amount has been transferred to the Flask.
Tools >> Transfer bar >> Precise transfer.	Change the transfer mode to Precise Transfer. Place the distilled water above the Erlenmeyer Flask. Transfer 5 ml distilled water into Erlenmeyer Flask. Type 5 in the Transfer amount text bar and click on Pour.
Click and drag distilled water to a corner.	Move the distilled water to a corner of the Workbench.
Cursor on Pipet.	Move the 5 ml Pipet onto Erlenmeyer Flask.
Type 10 in the Transfer amount(mL) text bar below >> click on Withdraw.	Type 5 in the Transfer amount text bar and click on Withdraw.
Point to Pipet	5 ml of water is withdrawn into the Pipet.
Drag the Pipet >> place it on volumetric Flask.	Drag the Pipet onto 100 mL Volumetric Flask.
Select Tools >> Transfer >> Realistic Transfer.	Change the transfer mode to Realistic Transfer using Tools menu.
Click on Pour button	Click on Pourbutton gradually so as to make up to the mark.
Point to the mark on volumetric Flask.	For colourless solutions, the lower meniscus must be on the 100 ml mark.
Point to the Flask. Point to solution info panel.	Click on the standard Flask. We now have 99.856 mL of sodium chloride(NaCl) solution as indicated in the Solution info panel.
Cursor on Solution Info Panel.	Click on the standard Flask. Solution Info Panel on the right displays the Species and the corresponding Molarity.
Cursor on the Solution Info Panel.	Observe that the concentration of sodium cation is approximately 1.0 molar.
Highlight the problem statement.	Go back to Problem description window. Similarly you can also try some of these problems.
Slide Number Summary	Let us summarize. In this tutorial we have learnt to prepare, 100 ml of 1 molar sodium chloride solution.
Slide Number Assignment	As an assignment, Prepare the following standard solutions, 250 ml of 5 molar sodium chloride solution 500 ml of 10 normal Magnesium chloride solution.
Slide Number13 About Spoken Tutorial project	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
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Slide Number 17 Acknowledgement	Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
	This tutorial is contributed by Snehalatha Kaliappan and Madhuri Ganapathi from IIT-Bombay. Thank you for joining.

Contributors and Content Editors

Madhurig, PoojaMoolya