Chapter 5 of 18
Revision Notes
Acids, Bases and Salts — Revision Notes
Maharashtra Board · Class 9 · Science
Acids, Bases and Salts revision notes for Maharashtra Board Class 9 Science: 4 topics in quick points. Includes Arrhenius Theory of Acids and Bases.
44 questions22 flashcards3 formulas & key relations5 concepts
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Key Topics to Revise
1
Arrhenius Theory of Acids and Bases
- Acid: A substance that dissociates in water to give H⁺ ions as the only cation
- Base: A substance that dissociates in water to give OH⁻ ions as the only anion
- Examples of acids: HCl, H₂SO₄, HNO₃, CH₃COOH
2
Classification of Acids and Bases
- Strong acids: HCl, HNO₃, H₂SO₄ - dissociate completely
- Weak acids: CH₃COOH, H₂CO₃ - dissociate partially
- Strong bases: NaOH, KOH, Ca(OH)₂ - dissociate completely
3
pH Scale and Concentration
- pH scale ranges from 0 to 14
- pH 7 = neutral (pure water)
- pH < 7 = acidic solution
4
Neutralization Reaction
- Acid + Base → Salt + Water
- H⁺ + OH⁻ → H₂O (net ionic equation)
- pH becomes 7 when equal amounts of strong acid and base react
Get complete notes with diagrams and examples
Full NotesKey Concepts
Acids are substances that produce H⁺A scale from 0 to 14The reaction between an acidNormal salts (pH = 7) fromWater molecules that are part
Frequently Asked Questions
What are the important topics in Acids, Bases and Salts for Maharashtra Board Class 9 Science?
Key topics in Acids, Bases and Salts include Arrhenius Theory of Acids and Bases, Classification of Acids and Bases, pH Scale and Concentration, Neutralization Reaction. Study these first, then practise questions on each for Class 9 exams.
How should I revise Acids, Bases and Salts for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Acids, Bases and Salts. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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