Class 10 Science table 2.2

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Class 10 Science table 2.2

S. No.	Solution		pH
1	Saliva (before meal)	Green	7.4	(Weakly alkaline) Basic
2	Saliva (after meal)	xxxx	xxxx	Depends upon the food eaten.
3	Lemon juice	Pink	2.5	Acidic.
4	Colourless aerated drink	Yellow/Green	5.0 – 6.0	Acidic
5	Carrot juice	Yellow/Green	5.0 – 6.0	Acidic
6	Coffee	Yellow	5.0	Acidic
7	Tomato juice	Orange	4.1	Acidic
8	Tap water	Green	6.5 – 8.5 (7.0)	Neutral
9	1 M NaOH	Purple	14.0	Strongly Alkaline (Basic)
10	1 M HCl	Res	0.0	Acidic

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Table 2.2 provides information on the pH values of various solutions. pH is a measure of the acidity or alkalinity of a solution and ranges from 0 to 14. A pH of 7 is neutral, pH values less than 7 are acidic, and pH values greater than 7 are alkaline or basic. The pH of a solution is an important factor that affects many chemical and biological processes.

Here are the details of the solutions mentioned in Table 2.2:

1. Saliva (before meal): Saliva is a weakly alkaline solution with a pH of 7.4. The alkaline nature of saliva helps in the initial digestion of food in the mouth.
2. Saliva (after meal): The pH of saliva after a meal depends upon the type of food eaten. The acidic or alkaline components of the food can affect the pH of saliva.
3. Lemon juice: Lemon juice is a highly acidic solution with a pH of 2.5. It contains citric acid, which gives it a sour taste.
4. Colourless aerated drink: Colourless aerated drinks such as soda and sparkling water are acidic with a pH range of 5.0 to 6.0. They contain carbonic acid, which gives them their fizzy texture.
5. Carrot juice: Carrot juice is also acidic with a pH range of 5.0 to 6.0. The acid in carrot juice comes from the natural citric acid present in the carrots.
6. Coffee: Coffee is an acidic beverage with a pH of 5.0. The acid in coffee is due to the presence of chlorogenic acid and other organic acids.
7. Tomato juice: Tomato juice is acidic with a pH of 4.1. It contains citric acid and other organic acids that give it its sour taste.
8. Tap water: Tap water is usually neutral with a pH range of 6.5 to 8.5. The pH of tap water can vary depending on the location and source of the water.
9. 1 M NaOH: Sodium hydroxide (NaOH) is a strongly alkaline or basic solution with a pH of 14.0. It is commonly used in industries for cleaning, manufacturing, and other purposes.
10. 1 M HCl: Hydrochloric acid (HCl) is a strongly acidic solution with a pH of 0.0. It is a corrosive substance and is used in industries for various purposes.

In conclusion, Table 2.2 provides valuable information about the pH values of various solutions, which can help us understand their properties and uses in different fields.