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

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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 verion 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 Sulfate.

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 1M(molar) solution we need 5.844 grams of Sodium Chloride.

Click on the Erlenmeyer Flask and drag.


Back to the workbench.


Drag the Scale to a convenient position on the Workbench.


Click on Erlemeyer 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 the Transfer amount(g) text bar below and 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 and drag the NaCl bottle Click and drag Sodium Chloride bottle to a different place on the Workbench.
Click, drag the Erlenmeyer Flask and place it on the Workbench. Remove the Erlenmeyer Flask and keep it aside.
Click on the Scale and press Backspace. To remove the Scale from the Workbench, Click on the Scale and press Delete.
Drag the Distilled water on to the 250ml Erlenmeyer Flask Drag the Distilled water on to the 250ml Erlenmeyer Flask.
Type 90 in the 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 and place the distilled water to a corner of the Workbench. Drag and place the distilled water to a corner of the Workbench.
Drag the volumetric flask next to Erlenmeyer flask. Place the volumetric flask next to Erlenmeyer flask.
Click and 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 Transferoption.

Click on Tools menu.

Scroll down and 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 and 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 and place it on the volumetric Flask. Drag the Pipet onto 100ml Volumetric Flask.
Select

Tools->Transfer->Realistic Transfer

Change the transfer mode to Realistic Transfer using Tools menu.
Click on Pour button Click on Pour button gradually so as to make upto 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 100 ml of sodium chloride(NaCl) solution as indicated in the Solution info panel.

Cursor on the 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 1molar sodium chloride solution.

Slide Number

Assignment

As an assignment,

Prepare the following standard solutions,


200 ml of 5 molar sodium chloride solution


500 ml of 10 normal Magnesium chloride solution.

Slide Number13:

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Slide Number 15:

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Slide Number 16

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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