PoojaMoolya: Created page with "{| border=1 ||'''Time''' ||'''Narration''' |- |00:01 ||Hello everyone. Welcome to this tutorial on '''Effect of Temperature on Solubility''' using '''Vlabs'''. |- ||..."

2019-01-30T10:41:51Z

Created page with "{| border=1 ||'''Time''' ||'''Narration''' |- |00:01 ||Hello everyone. Welcome to this tutorial on '''Effect of Temperature on Solubility''' using '''Vlabs'''. |- ||..."

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{| border=1
||'''Time'''
||'''Narration'''

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|00:01
||Hello everyone.

Welcome to this tutorial on '''Effect of Temperature on Solubility''' using '''Vlabs'''.

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||00:10
|| In this tutorial, we will learn

About solubility of salts with temperature.

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||00:16
||Check if solubility is exothermic or endothermic.

Study the relationship between solubility and heat transfer.

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||00:26
||To follow this tutorial, you should be familiar with

'''ChemCollective Vlabs''' interface.

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||00:33
||If not for relevant tutorials please visit our website.

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||00:39
||Here I am using

Mac OS version 10.10.5

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||00:45
||ChemCollective Vlabs version 2.1.0

Java version 8

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||00:53
||Here I have opened a '''virtual chemistry lab''' application window.

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||00:58
||Go to '''File'''->'''Load homework''' option.

Select '''Solubility and Solids'''.

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||01:06
||Click on '''Temperature and solubility of salts''' option.

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||01:11
||Click on problem description in the stockroom explorer.

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||01:16
||Please pause the video here and read the problem description.

Resume the video once you finish reading.

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||01:25
||The problem has 3 sections.

In the First section: Check solubilities of '''Potassium chloride''' and '''Cerium(III)sulphate''' with temperature.

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||01:36
||In Second section: Observe whether dissolution of '''Potassium chloride''' and '''Cerium sulphate''' is exothermic or endothermic.

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||01:46
||In the Third section: we have to explain the observations in section 1 and 2 based on a chemical principle.

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||01:55
||Click on '''Workbench'''.

Let us select required chemicals and apparatus for this experiment.

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||02:04
||From the '''Stockroom explorer''', Click on '''Potassium chloride, Cerius sulfate''' and '''Distilled water''' icons.

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||02:12
||Click on '''glassware''' icon.

Select 50 mL '''Graduated Cylinder'''.

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||02:19
||Again click on '''glassware''' icon.

Select 250 mL '''Erlenmeyer Flask'''.

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||02:27
||We need two copies of 250 mL '''Erlenmeyer Flasks'''.

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||02:33
||Use '''Duplicate''' option from the '''context menu''' to make the copies.

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||02:38
||Click on '''select tools''' icon.

Select '''Scale''' and '''Weighing boat'''.

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||02:48
||We need two copies of '''Weighing boats'''.

Again use '''Duplicate''' option from the '''context menu'''.

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||02:57
||Use '''context menu''' and rename the '''Erlenmeyer Flasks''' as 1 and 2.

Similarly rename the '''Weighing boats''' as 1 and 2.

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||03:13
||Now place each set of apparatus separately on the '''workbench'''.

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||03:18
||Drag the '''Distilled water''' tank over to '''graduated cylinder'''.

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||03:23
||In the '''Transfer amount input bar''', type 50.

Click on '''Pour'''.

Keep the '''Distilled water''' aside.

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||03:33
||Transfer 50 mL of '''Distilled water''' to flask 1 using '''Precise Transfer'''.

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||03:43
||Keep the '''graduated cylinder''' aside.

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||03:46
||Drag the '''weighing boat 1''' and place it on the '''scale'''.

Click on '''TARE'''.

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||03:52
||Drag the '''Potassium chloride''' bottle over to '''weighing boat 1'''.

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||03:57
||Type 5 in the '''transfer amount input bar'''. Click on '''Pour'''.

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||04:03
||Keep '''Potassium chloride''' bottle aside.

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||04:07
||Drag the '''weighing boat 1''' and place it on '''Flask 1'''.

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||04:12
||In the '''transfer amount input bar''', Type 5.

Click on '''pour'''.

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||04:18
||Keep the '''weighing boat''' aside.

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|| 04:21
||In the '''Solution Info Panel''', click on '''Solid''' radio button.

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||04:26
||Observe, '''Species''' and '''grams''' columns.

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||04:30
||Since all the '''potassium chloride''' is soluble in water, there is no solid '''Potassium chloride''' in the flask.

Hence it indicates zero grams.

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||04:41
||This indicates that '''potassium chloride''' is readily soluble in water.

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||04:47
||Let us keep on adding '''Potassium chloride''' to flask 1 until undissolved '''Potassium chloride''' remains in '''flask 1'''.

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||04:57
||Place the '''weighing boat 1''' back on the '''Scale'''. Click on '''TARE'''.

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||05:03
||Drag and place '''Potassium chloride''' bottle over '''weighing boat 1'''

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||05:09
||Type 15 in the '''transfer amount input bar'''. Click on '''pour'''.

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||05:15
||Keep '''Potassium chloride''' bottle aside.

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||05:19
||Change the '''Transfer Bar''' to '''Realistic Transfer''' using '''Tools''' menu.

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||05:25
||Drag and place '''weighing boat 1''' over '''flask 1'''.

Click on '''Pour''' button gradually.

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||05:33
||Observe the '''Solution info panel'''.

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||05:37
||Observe '''grams''' column, approximately 2 grams of '''Potassium chloride''' remains undissolved.

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||05:45
||Let us now check if increase in temperature increases or decreases the solubility.

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||05:52
||Click on '''Select tool''' icon, choose '''Bunsen Burner'''.

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||05:58
||Bring the '''Bunsen Burner''' close to '''flask 1'''.

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||06:02
||Place '''flask 1''' over '''Bunsen Burner'''.

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||06:06
||The flask gets heated quickly and undissolved '''potassium chloride''' dissolves completely.

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||06:14
||Observe the temperature, as temperature increases '''potassium chloride''' dissolves.

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||06:21
||At approximately 40o C, '''potassium chloride''' dissolves completely.

Note that '''grams''' column shows zero value.

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||06:33
||We can turn off the flame of the '''Bunsen Burner''' when not required.

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||06:39
||Click on the '''Burner'''. Two black arrows pointing up and down appear.

Click on the down pointing arrow to turn off the '''Burner'''.

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||06:51
||Now I will demonstrate the solubility of '''Cerium(III) Sulphate'''.

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||06:56
||Note that solubility of '''Cerium(III) Sulphate''' is much lower than '''potassium chloride'''.

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||07:04
||Transfer 50 mL of '''Distilled water''' to '''graduated cylinder''' using '''Precise transfer'''.

Keep the '''Distilled water''' aside.

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||07:17
||Now transfer 50 mL of '''Distilled water''' to '''flask 2''' using '''Precise transfer'''.

Keep the '''graduated cylinder''' aside.

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||07:28
||Drag '''Weighing boat 2''' and place it on the '''Scale'''.

Click on '''TARE'''.

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||07:35
||We will begin by dissolving just 1 gram of '''Cerium(III) Sulphate'''.

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||07:42
||Transfer 1 gram of '''Cerium(III) Sulphate''' to '''Weighing boat 2'''.

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||07:48
||Keep '''Cerium(III) Sulphate''' bottle aside.

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||07:52
||Transfer 1 gram of '''Cerium(III) Sulphate''' from '''Weighing boat 2''' to '''Flask 2'''.

Keep the '''Weighing boat''' aside.

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||08:03
||In the '''Solution Info panel''', observe '''Species''' and '''grams''' columns.

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||08:09
||Since all the Cerium(III) Sulphate''' is soluble in water, it indicates zero grams.

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||08:16
||Let us add more '''Cerium(III) Sulphate''' to '''flask 2''' to check the solubility.

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||08:23
||Place the '''Weighing boat 2''' back on the '''Scale'''. Press '''TARE'''.

Weigh 5 grams of '''Cerium(III) Sulphate'''.

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||08:32
||Change the '''transfer bar''' to '''Realistic Transfer'''.

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||08:36
||Drag and place '''Weighing boat 2''' over '''flask 2'''.

Click on '''Pour''' button gradually.

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||08:45
||Observe the '''Solution info panel'''.

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||08:49
||Observe '''grams''' column, approximately 3 grams of '''Cerium(III) Sulphate''' remains undissolved.

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||08:58
||Let us now check if increase in temperature increases or decreases the solubility.

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||09:05
||Bring the '''Bunsen Burner''' close to '''flask 2'''.

Place flask 2 over '''Bunsen Burner'''.

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||09:13
||Click on the up pointing arrow to turn-on the '''burner'''.

|-
||09:18
||Observe that '''grams''' column shows increase in value.

As temperature increases, solubility of '''Cerium(III)Sulphate''' decreases.

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||09:29
||Turn-off the '''Burner'''.

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||09:32
||For '''potassium chloride''', solubility increases with increase in temperature.

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||09:38
||For '''Cerium(III)Sulphate''', solubility decreases with increase in temperature.

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||09:44
||Click on '''Problem description''' window.

We need to check if dissolution of '''potassium chloride''' and '''Cerium (III) Sulphate''' is endothermic or exothermic.

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||09:56
||Click on '''Workbench'''.

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||09:58
||Let us delete '''Erlenmeyer Flasks''' from the '''workbench'''.

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||10:03
||Click on the flask and press '''Delete''' on the keyboard.

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||10:10
||Click on '''glassware''' icon.

Select '''Foam Cup'''.

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||10:15
||We need two copies of '''Foam Cups'''.

Use '''Duplicate''' option from the '''Context menu'''.

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||10:24
||Rename '''Foam Cups''' as 1 and 2.

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||10:30
||Change the '''Transfer Bar''' to '''Precise Transfer'''.

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||10:34
||Transfer 50 mL of '''Distilled water''' to '''graduated cylinder''' using '''Precise transfer'''.

Keep the '''Distilled water''' aside.

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||10:45
||Place '''Foam cups''' at a convenient location on the '''workbench'''.

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||10:50
||Transfer 50 mL of '''Distilled water''' to '''Foam cup 1''' using '''Precise transfer'''.

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||10:58
||Click on '''Foam cup 1'''.

In the '''Solution info panel''', observe the temperature on the thermometer.

It shows 25o C.

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||11:10
||'''Foam cups act as '''Calorimeter''' for measurements made at constant pressure.

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||11:17
||Heat exchange does not happen easily as it is a better insulator than glass.

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||11:25
||Place the '''weighing boat 1''' on the '''Scale'''. Press '''TARE'''.

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||11:31
||Weigh 5 grams of '''potassium chloride'''.

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||11:35
||Keep '''potassium chloride''' bottle aside.

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||11:39
||Bring '''weighing boat 1''' over to '''Foam cup 1'''.

Type 5 in the '''transfer amount input bar'''.

Click on '''pour'''.

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||11:51
||Again click on '''Foam cup 1'''.

Observe the temperature, it is now 21o Centigrade.

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||11:59
||Dissolution of '''potassium chloride''' in water absorbs heat, hence temperature decreases.

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||12:07
||It is an endothermic process.

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||12:10
||Now let us repeat the same procedure for '''Cerium(III) Sulphate'''.

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|| 12:15
||Fill the '''graduated cylinder''' with 50 mL '''Distilled water'''.

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||12:21
||Transfer 50 mL of water from '''graduated cylinder''' to '''Foam cup 2'''.

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||12:29
||Click on '''Foam cup 2'''.

Note the temperature of water, it shows 25o Centigrade.

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||12:38
||Place '''weighing boat 2''' on the '''Scale'''. Press '''TARE'''.

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||12:43
||Weigh 2 grams of '''Cerium(III) Sulphate'''.

Keep '''Cerium(III) Sulphate''' bottle aside.

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||12:52
||Drag '''Weighing boat 2''' over to '''Foam cup 2'''.

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||12:57
||Type 2 in the '''transfer amount input bar'''.

Click on '''Pour'''.

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||13:03
||Keep the '''Weighing boat''' aside.

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||13:06
||Again Click on '''Foam cup 2'''.

Observe the temperature, it is now 27.54o Centigrade.

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||13:17
||Dissolution of '''Cerium(III) Sulphate''' in water releases heat, hence temperature increases.

It is an exothermic process.

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|| 13:28
||Let us now analyse the results.

We observed that: For an endothermic process, solubility increases as temperature increases.

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||13:39
|| For an exothermic process, solubility decreases as temperature increases.

These observations follow '''Le Chatelier's principle'''.

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||13:50
||Let us summarize.

In this tutorial we have Determined the solubilities of potassium Chloride and Cerium(III)sulphate with increase in temperature.

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||04:02
||Observed that solubility of, potassium chloride is Endothermic and

Solubility of Cerium(III)Sulphate is exothermic.

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||14:13
||As an assignment,

List some examples of exothermic and endothermic processes in your daily lives.
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||14:23
||Explain why heat is absorbed or evolved during a reaction.

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||14:29
||Determine whether dissolution of '''Sodium Chloride''' is exothermic or endothermic.

(Hint: The problems are under '''Solubility''' topic in '''load homework''' window)

|-
||14:43
||The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

|-
||14:52
||The Spoken Tutorial Project team: conducts workshops using spoken tutorials and

gives certificates on passing online tests.

For more details, please write to us.

|-
||15:05
||Please post your timed queries in this forum.

|-
||15:10
||Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

|-
|| 15:22
||This tutorial is contributed by Snehalatha kaliappan and Madhuri Ganapathi from IIT Bombay.

Thank you for joining.
|-
|}

ChemCollective-Virtual-Labs/C2/Effect-of-temperature-on-solubility/English-timed - Revision history

PoojaMoolya: Created page with "{| border=1 ||'''Time''' ||'''Narration''' |- |00:01 ||Hello everyone. Welcome to this tutorial on '''Effect of Temperature on Solubility''' using '''Vlabs'''. |- ||..."