Page 1 - 3. LESSON NOTES(CH-2-PH IN EVERYDAY LIFE)

SAI International School
Class-X

Subject_ Chemistry
Topic- Acids, Bases & Salts
Sub Topic- pH in Every Day Life

LESSON NOTES
➢ pH plays a very important role in our everyday life.

1- Plants and animals are pH sensitive.

2- pH of the soil should be equal to 7 [neutral] for healthy growth of plants.

3- Acid in our stomach has low pH and antacids are alkaline and have high
pH that neutralizes the acid.

4- pH of milk changes when it becomes curd in which, amount of lactic acid
is more so curd is more acidic.

5- Toothpaste is alkaline and has high pH. So they neutralize the excess
acid in the mouth produced by bacteria.

1- Plants and animals are pH sensitive.

• Living organism works within a narrow range of pH of 7.0 to 7.8 only.
If this pH range increases or decreases, living organism find it difficult to survive.

• When pH of rain water is less than 5.6, it is called acid rain.
When acid rain flows into the rivers, it lowers the pH of the river water. The
survival of aquatic life in such rivers becomes difficult.

Formation of Acid Rain in Atmosphere

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