acid bases indicators

7/27/2019 Acid Bases Indicators

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Al PrIsProductionsroudlyresentsACIDS,BASES

Indicators

Al PrIsProductions


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Objectives

Target Audience

Duration Two Period lessons ( 1 hour)

Sec 3 ExpressScience(Chemisty)

a) Suggest a suitable method for the identification of pH on

different substances.

b) Students are able to plan their own investigations in solving a

problem.

c) Students are able to effectively source the Internet to extract the

information required.

d) Students are able to hypothesize and write a report on theirinvestigation.

e) Solve the problem of the dying crops..


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THE PROBLEM

Farmer Brown

is my name & Ihave a story to

tell. You see, I

own a farm.

I harvest

maize every

year. Then

one day, the

rain came.

Something

happened.

All my crops

died

after that.

I am very

puzzled.Can you help

me solve this

problem?

SOLVE


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The Story

Solve theproblem

To refresh

your knowledge

Some useful

websites

Problem

Solving

worksheet

Click here to find out what Farmer Brown is

troubled over.

Click here to help Farmer Brown solve hisproblem.

Click here to test yourself on your concepts on

Acids, Bases & Indicators.

Click here for websites on Acids, Bases &

Indicators.

Click here to print out &

write in your answers.Worksheet 2Worksheet 1


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Acids Alkal is

ACTION WITH LITMUS PAPER

Turns red

litmus paper

blue

Turns blue

litmus paper

red


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Acids

REACTIONS WITH OTHER SUBSTANCES

Reacts with metals

to give off salt and

hydrogen gas

Reacts with metal

carbonates to give

off salt and carbon

dioxide gas

MetalHydrogen

GasCarbon

Dioxide

Metal

Carbonates


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Alkal is

REACTIONS WITH OTHER SUBSTANCES

Reacts withAmmoniumsalts to

giveoff salts,ammonia gas andwater when warmed

Ammonia

Gas

Ammonium

Salts

HEAT


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Acid

NEUTRALISATION

Acid + Alkali = Salt + Water

Salt

Alkali

Water


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Why are the crops dying?

Could it be due to the soil ? Could it be due to the rain ?

How would you test ???

Write your suggestion in the worksheet provided.
http://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Soil.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Soil.htm


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Should I add an alkali ? Should I add a carbonate ?

Which one would you use ???Write your answer in the worksheet provided.

How to save the dying crops?


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If you have added an alkali

The crops did not grow well when

an alkali was added.

WHY ?

Write your answer in the worksheet.
http://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/PED%20513/soil.htm


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If you have added a carbonate

You have save both Farmer Brown &

his farm.

WHY ?Write your answer in the worksheet.
http://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/PED%20513/soil.htm


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Encyclopedia

CHEMTUTOR

Online Tutorial

FROM NEW

ZEALND

Click here to find out more from the

Encyclopedia website.

WHAT IS AN ACID AND A BASE?

Click here to test yourself on your concepts on

Acids, Bases & Indicators online.

Do sections 1 and 15

YET ANOTHER USEFUL WEBSITE

Soil Rain
http://www.encyclopedia.com/articles/00084.htmlhttp://www.chemtutor.com/acid.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.carlton.paschools.pa.sk.ca/chemical/equilibrium/abindicators.htmhttp://www.carlton.paschools.pa.sk.ca/chemical/equilibrium/abindicators.htmhttp://www.chemtutor.com/acid.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Soil.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Soil.htmhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemtutor.com/acid.htmhttp://www.carlton.paschools.pa.sk.ca/chemical/equilibrium/abindicators.htmhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemtutor.com/acid.htmhttp://www.encyclopedia.com/articles/00084.html


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1) Sounds used in this microlesson were taken fromMicrosoft clipart and www.soundcentral.com.

This author of this website allows the use of his sounds

for educational purposes.

2) Pictures used were taken from Microsoft Clipart Gallery

3) 1999-2000 http://www.barrysclipart.com/The author of

this website allows the use of his clip art as long as credits

is made.

Prepared by: Aldrin Thomas John & Teng WeiSyan, PrisciliaDIVISION OF INSTRUCTIONAL SCIENCE

national institute of educationcopyright 2000

ACKNOWLEDGEMENT

End
http://www.soundcentral.com./http://www.barrysclipart.com/http://www.barrysclipart.com/http://www.soundcentral.com./http://www.soundcentral.com./