1. ACID BASE CHEMISTRY PRESENTED BY- kum. Chavan S.B.
School- New English School, Erandoli
Tal : Miraj Dist: Sangli

2. STRENGTH OF ACIDS & BASES ACIDS BASE & THEIR REACTIVITY
ACID & BASE SUB UNITS
ACIDS & BASES
INDICATORS
STRENGTH OF ACIDS & BASES
ACIDS BASE & THEIR REACTIVITY
IONIZATION OF ACIDS & BASES

3. PRIVIOUS KNOWLEDGE Basic property of acids Basic property of bases
Some acids that are useful in our daily life
Some bases in everyday life
Indicators. Eg-litmus paper, phenolphthalein, methyl orange etc.
Reaction of acid & base with metal nonmetal carbonates & bicarbonates

4. PREVIOUS KNOWLEDGE NEW APPORACH
Sugarcane-sweet Tamarind-sour Alum-sour Amla- sour Gherkin(tondli)-bitter ACID means SOUR taste BASE means BITTER taste

5. NEW ADDITION NAME OF ACID CHEMICAL FORMULA Acetic Acid CH3COOH
Formic acid
HCOOH
Carbonic acid
H2CO3
Phosphoric acid
H3PO4

6. PREVIOUS KNOWLEDGE Traffic signal Speed braker Road signs School bell
Alarm,fire alarm ,ambulance alarm
All these are indicator
In chemistry ACIDIC AND BASIC Nature of compounds indicated by some natural and chemical substances are called INDICATORS

7. NEW INDICATORS Universal indicators -Mixture of several indicators
Olfactory indicator – Eg.- Nilgiri oil ,Cologne water
Old indicators-Litmus , Turmeric, Phenolphthalein , Methyl orange , Eosin

8. GROUP ACTIVITY pH means potenz means concentration. SAMPLE
ORIGINAL COLOUR pH
NATURE
KOKAM JUICE
RED 4
ACIDIC
PALAK JUICE
GREEN 8
BASIC
TOMATO 5
DIL.KOH
COLOURLESS 13
PREPARED TEA
BROWN
PUMPKIN
MUDDY
CUCUMBER
FAINT GREEN
pH means potenz means concentration.

9. Activity-1
pH RANGE
NATURE
0-3
7-9
3-5
9-12
5-7
12-14 7

10. THINK IT OVER In your family some person suffer from acidity
What are the symptoms?
Why it happens?
What house hold remedies you use?
What is the traditional treatment for honey bee sting ? What is the reason behind it?

11. IMPORTANCE OF pH IN & AROUND US
ACTIVITY- Collect sample of rainwater, find out colour change of pH Paper and pH Of rainwater.
What is the nature of rainwater?
THINK IT OVER
1. Finding pH of water why we use rain water?
2. If pH of rain water is less than 7, what is the nature of rain water?
3. If such water flows in river how it affects living things?Explain.

12. IMPORTANCE OF pH IN EVERYDAY LIFE
-IN BIOLOGICAL SYSTEM (PLANTS & ANIMAL)
IN HUMAN AND ANIMAL-
1. Human blood, tears and saliva have pH of nearly 7.4
2. If pH falls below 7 or rise more than 7.8 it becomes difficult for survival of living things
IN PLANTS –
1.They have healthy growth only if soil has specific pH which should be nither alkaline nor highly acidic

13. ACTIVITY 1. Agri .Soil = (2g) +5ml of water -> Filter it.
In the Filtrate dip universal indicator paper.
Ph of soil=
2. Tooth Decay=
Tooth decay is cause by acid.
Our tooth enamal is made of calcium phosphate.
It is insoluble in water
But if pH of our body falls below 5.5 our mouth is moderately acidic and tooth decay begins
So how we can we stop tooth decaying?
By using tooth paste and good quality tooth brush

14. ADDITIONAL INFORMATION
1. Self defence of animal by chemical warfare
Stung by a honey bee and yellow ant we feel pain and irritation because of formic acid (methanoic acid)
Plants like nettle have leaves with stingy hair
2.Regaining shine of a tarnished copper vessel by use of acid
Ans.-
Copper oxide is basic in nature
Tamarind is acidic in nature
Layer of copper oxide is removed by citric acid

15. ACTIVITY Test the pH values of following solutions –
1. Saliva(before meal)
2. Saliva (after meal)
3. Lemon juice
4. Carrot juice
5. Coffee
6. Tap water

16. HOTS QUESTION
Aqueous HCl shows change of litmus paper but dry HCl does not . Why?
Tooth enamal is hardest substance in our body. How does it undergo damage by eating sweets ? What should we do to prevent it?
After vigorous exercise we go through cramps &pain in muscles ?
Name the scientist who has given pH scales?
Ethyl alcohol contains H as well as OH, then why it is not acidic or basic?
Why are people suffering from stomach pain due to acidity, advised to drink cold milk?