Acids & Bases Provides understanding of acid/base chemistry Scaffolds learning to appreciate real life chemistry

1. Acids & Bases
www.drlakshmisharma.com
Dr Lakshmi Sharma
NO LIMITS TO LEARNING! BELIEVE
& YOU CAN ACHIEVE!
Enrichment workshop for Gifted Kids

2. Acids & Bases
BEWARE

3. How do we characterise
chemicals/solutions ?

4. Acidic
Basic
Neutral
Examples ???

5. How do we know if Acid/Base/Neutral
?

6. pH defines a/b/n
Do you know the pH scale ????

8. What is an Acid ?

9. What is an Acid ?
A proton donor (H+)
A pH less than 7
Reacts with bases

10. Which do you think are Acids ?
Game 1

11. Acids Ethanoic acid
Carbonic acid
Tannic acid
Ascorbic acid
Citric acid

12. What will happen next ?
Drop an old coin in coke & watch what happens !
Now think of your teeth when you drink Coke !

13. What is a Base ?
A proton acceptor (H+)
A pH greater than 7
Reacts with acids

14. Can you name any bases?

15. Which do you think are bases?

16. Household cleaners
Drain cleaners
Oven cleaners
sodium hydroxide & ammonia
Weak bases-toothpaste
antacid tablets & Baking powder.
Bases

17. Strongest - Super !!!!!
• Carborane Acid H(CHB11Cl11) pka -25
• Lithium Diisopropylamide [(CH3)2CH]2NLi pkb 22

18. Acids and Bases in Nature

19. Body Buffer pH
Outside the acceptable range of pH
Proteins are denatured and digested
Enzymes lose their ability to function
Death may occur

20. Humans
Gout
Uric Acid

21. Red Litmus Blue Litmus
Acidic solution Stays red Turns red
Neutral solution Stays red Stays blue
Alkaline solution Turns blue Stays blue
Litmus Paper

22. Universal Indicator
Mixture of indicators:specific ph identified (1-14)

23. pH Meter

24. Experiment !!!!
Which is an Acid or Base?

25. Red cabbage - flavin
(an anthocyanin)-indicator
pH 2 4 6 8 10 12
Color Red Purple Violet Blue Blue-Green Greenish
Yellow

27. Neutralisation
Acid + Base = Salt + Water & Gas

28. Bouncing Egg !!!!
Soak hard boil or raw egg in
vinegar for 1-2 days

29. What Happens ???
The acid breaks down the shell
into carbon dioxide and lime.

30. Experiment 2.
Making a bath FIZZ !!!

31. Bath Fizz
Sodium bicarbonate reacts with citric acid when
dissolved in water
3NaHCO3 + C6H8O7 --> C6H5Na3O7 + 3CO2 + 3H2O

32. Bath Fizzes
1. Take all of the ingredients provided &
roll into a ball
2. Leave to dry
3. Wrap & surprise mum & Dad!
4. Have a nice bath !!!!

33. Dr Lakshmi Sharma
www.drlakshmisharma.com
NO LIMITS TO LEARNING!
BELIEVE & YOU CAN ACHIEVE!
Remember Acids & Bases are Everywhere !
Even Inside You !
Hope You Enjoyed This Workshop !!!