NCERT Solutions for Class 7 Science Chapter 5
Important NCERT Questions
7th Chapter 5 Acids, Bases and Salts
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 1
State differences between acids and bases.
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Here are the fundamental differences between acids and bases:
Acids:
1. Hydrogen Ion Providers: Acids release hydrogen ions (H⁺) when dissolved in water, leading to an increase in the concentration of these ions in the solution.
2. Taste and Feel: Acids often taste sour (e.g., citrus fruits, vinegar) and can cause a tingling or burning sensation on the skin.
3. pH Range: Acids have pH values below 7. They turn blue litmus paper red and can be neutralized by bases.
4. Examples: Common examples include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and citric acid.
Bases:
1. Hydroxide Ion Providers: Bases release hydroxide ions (OH⁻) when dissolved in water, increasing the concentration of these ions in the solution.
2. Taste and Texture: Bases typically have a bitter taste (e.g., baking soda) and feel slippery or soapy to the touch.
3. pH Range: Bases have pH values above 7. They turn red litmus paper blue and neutralize acids.
4. Examples: Common examples include sodium hydroxide (NaOH), potassium hydroxide (KOH), and ammonia (NH₃).
Chemical Reactions:
1. Neutralization: Acids react with bases in a neutralization reaction to form salts and water.
2. Corrosiveness: Some strong acids (e.g., sulfuric acid) and bases (e.g., sodium hydroxide) can be corrosive and potentially harmful to living tissues and certain materials.
Understanding these distinctions helps classify substances based on their acidic or basic properties, facilitating their identification and application in various fields like chemistry, industry, and everyday life.
Acids:
1. Its taste is sour.
2. When added to litmus solution, it turns red.
3. Examples: Curd, lemon juice and vinegar.
Bases:
1. Its taste is bitter.
2. When added to litmus solution, it turns blue.
3. Examples: Baking soda, Soap and lime water.