Question

What is the pH scale, and why is pH important in everyday life?

Hint:

The {pH scale ranges from 0 to 14}: 0–6 → Acidic, \quad 7 → Neutral, \quad 8–14 → Basic.

Answer 1

Concept: The strength of acids and bases in aqueous solutions is measured using the pH scale. It indicates the concentration of hydrogen ions \((H^+)\) present in a solution.
Step 1:Definition of pH Scale The pH scale is a scale used to measure the acidity or alkalinity of a solution. It ranges from 0 to 14.

• \(pH < 7\) → Acidic solution
• \(pH = 7\) → Neutral solution
• \(pH > 7\) → Basic (alkaline) solution

Lower pH values indicate stronger acids, while higher pH values indicate stronger bases.
Step 2:Importance of pH in Everyday Life

• pH of soil: Plants grow well in soil with a suitable pH. Farmers use fertilizers or lime to adjust soil pH.
• pH in the human body: The pH of blood must remain around 7.4 for proper functioning of the body.
• Tooth decay: When the pH in the mouth falls below 5.5, tooth enamel begins to decay. Toothpaste is basic and helps neutralize acids.
• pH of water bodies: The pH of rivers and lakes must remain balanced to support aquatic life.
• Stomach digestion: Hydrochloric acid in the stomach helps in digestion by maintaining a low pH.