PhET/C2/pH-Scale/English-timed - Revision history

PoojaMoolya at 06:44, 28 January 2020

2020-01-28T06:44:16Z

Sandhya.np14 at 06:03, 10 August 2018

2018-08-10T06:03:44Z

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Madhurig at 11:56, 7 August 2018

2018-08-07T11:56:00Z

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Sandhya.np14 at 10:31, 7 August 2018

2018-08-07T10:31:46Z

Sandhya.np14: Undo revision 43969 by Sandhya.np14 (talk)

2018-08-07T09:35:42Z

Undo revision 43969 by Sandhya.np14 (talk)

Sandhya.np14 at 08:42, 7 August 2018

2018-08-07T08:42:17Z

PoojaMoolya: Created page with "{| border =1 ||'''Time''' ||'''Narration''' |- |00:01 | Welcome to this Spoken tutorial on '''pH scale''' using '''interactive PhET simulation'''. |- |00:08 | In this tutor..."

2018-08-01T05:37:22Z

Created page with "{| border =1 ||'''Time''' ||'''Narration''' |- |00:01 | Welcome to this Spoken tutorial on '''pH scale''' using '''interactive PhET simulation'''. |- |00:08 | In this tutor..."

New page

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

|-
|00:01
| Welcome to this Spoken tutorial on '''pH scale''' using '''interactive PhET simulation'''.

|-
|00:08
| In this tutorial we will learn-

How to use '''interactive PhET simulation''', '''pH scale'''.

|-
|00:15
| To follow this tutorial,

Learners should be familiar with topics in high school science.

|-
|00:22
| Here I am using-

Ubuntu Linux OS version 14.04

Java version 1.7.0

Firefox Web Browser version 53.02.2.

|-
|00:38
| Using this '''simulation''' we will learn to-

Determine whether a given solution is an '''acid''' or a '''base'''.

|-
|00:49
|Arrange '''acids''' and '''bases''' according to their strength. Determine the '''concentration''' of '''hydroxide ion''', '''hydronium ion''' and '''water''' at a given '''pH'''.

|-
|01:01
| Using this '''simulation''' we will learn about,

'''pH''' of a solution.

Effect of dilution on '''pH''' of a solution.

'''Logarithmic''' and '''Linear''' scale.

|-
|01:16
| '''pH scale''' is a, numeric scale used to specify the '''acidity''' or '''basicity''' of an aqueous solution.

|-
|01:25
| '''pH''' is a measure of '''hydrogen ion concentration''' in mol/L.

|-
|
| '''pH''' is negative '''logarithm''' to base 10 of '''hydrogen ion concentration'''.
'''pH = - log[H]'''

|-
|01:37
| For '''Acidic''' solutions, '''pH''' is less than 7(< 7).

|-
|01:42
|For '''Basic''' solutions, '''pH''' is greater than 7 (> 7).

|-
|01:47
|For '''Neutral''' solutions, '''pH''' is equal to 7 (= 7).

|-
|01:52
| Use the given link to download the '''simulation'''.

[http://phet.colorado.edu/ http://phet.colorado.edu]

|-
|01:57
| I have already downloaded the '''pH Scale PhET''', to my '''Downloads''' folder.

|-
|02:02
| To open the '''simulation''', right click on '''ph-scale html file'''.

|-
|02:08
|Choose the option '''Open With Firefox Web Browser'''. The file opens in the '''Browser'''.

|-
|02:16
| This is the ''' interface'''of '''pH scale simulation'''.

|-
|02:20
| The '''interface''' has three screens-

'''Macro'''

'''Micro'''

'''My solution'''

|-
|02:27
| Let us begin our '''simulation''' with '''Macro''' screen. Click on '''Macro''' screen to open it.

|-
|02:36
| This screen has-

A '''pH scale''' on the left, to display '''pH''' range from 0 to 14.

|-
|02:44
|A green '''probe''' attached to '''pH scale''' to measure '''pH''' and A '''pH meter''' to show '''pH''' of the liquids.

|-
|02:54
| A '''Water pump''' on the right side of screen to add '''water'''.

|-
|02:59
|A Graduated '''water container''' filled by default with '''Chicken Soup'''.

|-
|03:05
|A '''pump''' to remove solution is attached at the bottom left of the '''container'''.

|-
|03:11
| A '''Dropper''' to add liquid.

|-
|03:14
|A '''Drop down box''' to choose one of the liquids.By default '''Chicken Soup''' is selected.

|-
|03:22
| A '''Reset Button''' is provided at the right hand side bottom corner.

|-
|03:28
| Click on the '''drop down arrow'''.

|-
|03:31
|Scroll to '''Battery Acid ''' and click on it. Notice that, the '''container''' is filled with '''Battery Acid''' up to 0.50 L (0.5litres).

|-
|03:42
| Drag the green '''probe''' into the '''container''' and Observe the '''pH'''.

|-
|03:48
|'''Meter''' shows the '''pH''' value as 1.0. As '''pH''' is less than 7(<7), '''Battery Acid''' is an '''acidic''' solution.

|-
|03:58
| Now click on the '''water pump''' to add more '''water'''.

|-
|04:03
|Increase the '''water''' level up to 1Litre. Observe the change in '''pH''' on addition of '''water'''.
Now '''pH meter''' shows '''pH''' value as 1.30.

|-
|04:16
| Notice that '''pH''' of '''Battery Acid''' increases on addition of '''water'''. This is because '''hydrogen [H] ion concentration''' decreases with dilution.

|-
| 04:28
| Now we will select another solution.

|-
|04:32
| Click on '''drop down arrow'''.

|-
|04:34
|Scroll to '''Hand Soap''' and click on it. '''Container''' is filled with '''Hand Soap''' solution.

|-
|04:42
| Here, '''pH meter''' shows the value of '''pH''' as 10.00. This indicates that '''Hand Soap''' is '''basic''' in nature.

|-
|04:54
| Click on '''water pump''' to add '''water''' to ''' Hand Soap''' solution.

|-
|04:59
| For 1 L, '''Hand Soap''' solution shows a '''pH''' value of 9.70.

|-
|05:06
|We can see that '''pH''' of '''Hand Soap''' solution decreases on dilution.

|-
|05:12
|This is because '''hydroxide ion (OH) concentration''' decreases with dilution.

|-
|05:18
| Click on the bottom '''pump''' to remove half litre of '''Hand Soap''' solution.

|-
|05:24
|Click on the '''dropper''' and increase the level of '''Hand Soap''' solution to 0.6 L. Notice the change in '''pH'''.

|-
|05:34
|It increases as '''concentration''' of '''hydroxide ion (OH)''' increases.

|-
|05:39
| Now we will arrange the '''acids''' and '''bases''' according to their strengths.

|-
|05:45
|For that we will check the '''pH''' of different liquids.

|-
|05:50
| Click on '''drop down arrow''' and select '''Blood'''. '''Container''' is filled with '''Blood''' up to 0.50 L.

|-
|05:59
| '''Meter''' shows the '''pH''' value as 7.40. As '''pH''' is greater than 7( >7), '''Blood''' is a '''basic''' solution.

|-
|06:09
|Again click on '''drop down arrow''' and select '''Orange Juice'''.

|-
|06:14
|'''Meter''' shows '''pH''' value as 3.50 for 0.50 L. It is clear that '''Orange Juice''' is an '''acidic''' solution.

|-
|06:26
| According to the above '''pH''' values the order is as follows.

'''Hand soap > Blood > Orange Juice> Battery Acid'''.

|-
|06:38
| As an assignment,

Check the '''pH''' of each liquid.

And arrange the liquids according to the '''pH''' range.

|-
|06:48
|Now, we will move on to Micro screen. Click on Micro screen at the bottom of the interface.

|-
|06:57
|This screen has the following tools-

A '''pH scale''' on the left hand side of screen.

|-
|07:04
|A switch on the top of '''pH scale''' to select between '''Concentration''' and '''Quantity'''.

A red button with a minus(-) to hide '''pH scale'''.

|-
|07:16
|A switch at the bottom to select between '''Logarithmic''' and '''Linear scale'''.

|-
|07:22
| Check boxes to select-

'''Hydronium ion''' to '''hydroxide ion ratio''' '''(H30+/OH- )''' and '''Molecule count'''.

|-
|07:30
|In the '''pH meter''', a red button with a minus(-) to hide '''pH reader''' and value.

|-
|07:38
| Click on the '''drop down arrow''' and select '''Soda Pop'''.'''Container''' is filled with '''Soda Pop'''.

|-
|07:46
| '''pH meter''' shows '''pH''' value as 2.50. It means, '''Soda Pop''' is an '''acidic''' solution.

|-
|07:54
| As '''Soda Pop''' is '''acidic''', '''Concentration''' of '''hydronium ion''' is high and '''hydroxide ion''' is low.

|-
|08:02
| Then click on '''Quantity(mol)''',

|-
|08:05
|We will see the number of moles of '''hydronium ion''', '''hydroxide ion''' and '''water'''.

|-
|08:12
| Let us change '''Logarithmic scale''' to '''Linear'''. To do so click on '''Linear''' .

|-
|08:20
|The '''pH scale''' changes to '''Linear''' mode. We also see that '''pH''' values become '''Linear'''.

|-
|08:28
|But we will not use '''Linear scale''' as '''pH''' is in '''Logarithmic scale'''.

|-
|08:34
| Click on''' Hydronium ion '''to''' hydroxide ion ratio (H30+/OH-) ''' check box.

|-
|08:39
|A large number of red dots are seen in the '''container'''. These are '''hydronium ions'''.

|-
|08:46
|A few blue dots that are seen are '''hydroxide ions''' (OH).

|-
|08:51
| To see count of molecules in '''Soda Pop''', click on '''Molecule count''' check box.

|-
|08:57
|Count of '''hydronium ions''', '''hydroxide ions''' and '''water''' molecules in '''Soda Pop''' is seen.

|-
|09:05
| Let us see how dilution affects the number of molecules.

|-
|09:10
|Click on '''water pump''', fill the '''container''' up to 1 L. Observe the change in '''Molecule Count'''.
Note the increase in '''pH''' value. '''pH''' becomes 2.80.

|-
|09:25
| As an '''assignment''', Measure the '''pH''' of '''Blood''' sample.

|-
|09:30
|Observe the change in '''Molecule Count''' and '''H30+/OH- ratio''' after dilution.

|-
|09:37
| Now, we will move on to '''My Solution''' screen. Click on '''My Solution''' screen at the bottom of the '''interface'''.

|-
|09:46
| '''My Solution''' screen has the same tools as that of '''Macro''' and '''Micro''' screens.

|-
|09:53
| This screen also has some additional tools.

|-
|09:57
|A Graduated '''container''' on the right hand side of screen. A '''pH meter''' to adjust '''pH''' directly.

|-
|10:05
| This screen allows direct manipulation of '''pH''' or ion '''concentration'''.

|-
|10:11
| In this screen, we can make a solution of our choice in two ways-

By moving the '''H30+'''or '''OH-''' slider on '''pH scale'''.

By clicking black arrow upwards or downwards.

|-
|10:28
| Let us move the '''hydronium ion (H30+)''' slider upwards.

|-
|10:32
|Notice that, simultaneously '''Hydroxide ion(OH-)''' slider also moves downwards.

|-
|10:38
| Let's make a solution of '''pH''' 4.0 by clicking the black arrow downwards. This is an '''acidic''' solution.

|-
|10:48
| Now, Click on '''Hydronium ion''' to '''hydroxide ion (H30+/OH- )ratio''' and '''Molecule count''' check boxes.

|-
|10:55
|Notice that '''Molecule count''' for '''hydronium ion''' (H30+) is 3.01 x 1019.

|-
|11:01
| As an '''assignment''',

Make solutions of '''pH''' 7.0 and 9.0.

Observe and compare the change in molecules.

|-
|11:13
| Let us summarize.

In this tutorial we have learnt about, '''interactive PhET simulation, pH scale'''.

|-
|11:22
| Using this simulation we have learnt to-

Determine whether a given solution is an '''acid''' or a '''base'''.

|-
|11:31
|Arrange '''acids''' and '''bases''' according to their strength.

|-
|11:36
|Determine the concentration of '''hydronium ion''', '''hydroxide ion''' and '''water''' at a given '''pH'''.

|-
|11:43
| '''pH''' of a solution.

Effect of dilution on '''pH''' of solution.

'''Logarithmic''' and '''Linear scale'''.

|-
|11:53
| The '''video''' at the following link summarizes the Spoken Tutorial project. Please download and watch it.

|-
|12:02
| The '''Spoken Tutorial Project''' team:

Conducts workshops using spoken tutorials and gives certificates on passing online tests.
For more details, please write to us.

|-
|12:15
| Please post your timed queries in this forum.

|-
|12:21
| This project is partially funded by Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching.

|-
|12:29
| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.

|-
|12:41
| This is '''Meenal Ghoderao''' from '''IIT Bombay'''. Thank you for joining.

|}

@@ Line 53: / Line 53: @@
 |-
+|01:30
 | '''pH''' is negative logarithm to base 10 of hydrogen ion concentration.

@@ Line 32: / Line 32: @@
 |00:38
 | Using this '''simulation''' we will learn to-
 Determine whether a given solution is an '''acid''' or a '''base'''.
 |-
 |00:49
-|Arrange '''acids''' and '''bases''' according to their strength. Determine the '''concentration''' of '''hydroxide ion''', '''hydronium ion''' and '''water''' at a given '''pH'''.
+|Arrange '''acids''' and '''bases''' according to their strength,
 |-

@@ Line 5: / Line 5: @@
 |-
 |00:01
-| Welcome to this '''Spoken tutorial''' on '''pH scale''' using '''interactive PhET simulation'''.
+| Welcome to this Spoken tutorial on '''pH scale''' using '''interactive PhET simulation'''.
 |-
 |00:08
-| In this tutorial, we will learn- how to use '''interactive PhET simulation''', '''pH scale'''.
+| In this tutorial we will learn-
 |-
 |00:15
-| To follow this tutorial, learners should be familiar with topics in high school science.
+| To follow this tutorial,
 |-
@@ Line 19: / Line 23: @@
 | Here I am using-
-'''Ubuntu Linux OS''' version 14.04
+Ubuntu Linux OS version 14.04
-'''Java''' version 1.7.0
+Java version 1.7.0
-'''Firefox Web Browser''' version 53.02.2.
+Firefox Web Browser version 53.02.2.
 |-
 |00:38
 | Using this '''simulation''' we will learn to-
-determine whether a given solution is an acid or a base,
 |-
 |00:49
-|arrange acids and bases according to their strength,
+|Arrange '''acids''' and '''bases''' according to their strength. Determine the '''concentration''' of '''hydroxide ion''', '''hydronium ion''' and '''water''' at a given '''pH'''.
-determine the concentration of hydroxide ion,
 hydronium ion and water at a given '''pH'''.
 |-