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I. Chapter Summary
This chapter introduces the fundamental concepts of acids, bases, and salts through their physical and chemical properties, uses, and reactions. Students learn how to identify acids and bases using indicators, the pH scale, and understand neutralization reactions. It also covers the preparation and uses of important salts like sodium chloride, baking soda, washing soda, and bleaching powder. The role of acids and bases in daily life and industries is emphasized through real-world examples.
II. Key Concepts Covered
Concept
Description
Acids
Substances that produce H⁺ ions in aqueous solutions (e.g., HCl, H₂SO₄).
Bases
Substances that produce OH⁻ ions in aqueous solutions (e.g., NaOH, NH₄OH).
Indicators
Substances that show a color change in acidic or basic solutions (e.g., litmus, phenolphthalein, methyl orange).
pH Scale
Measures the hydrogen ion concentration; ranges from 0 (acidic) to 14 (basic).
Neutralization Reaction
Reaction between an acid and a base to form salt and water.
Formed by reaction of acidic oxides (SO₂, NO₂) with water; harmful to life and buildings.
Uses of Salts
Domestic, industrial, and medical applications of salts and their derivatives.
III. Important Questions
(A) Multiple Choice Questions (1 Mark)
Which of the following gives a pink color with phenolphthalein? a) HCl b) NaOH ✅ (PYQ 2020) c) CH₃COOH d) Lemon juice
Which one of the following is an example of a neutral salt? a) NaCl ✅ b) Na₂CO₃ c) NH₄Cl d) CH₃COONa
Which acid is present in vinegar? a) Citric acid b) Lactic acid c) Acetic acid ✅ d) Oxalic acid
Which of the following substances is basic in nature? a) Lemon juice b) Milk of magnesia ✅ c) Curd d) Vinegar
(B) Short Answer Questions (2/3 Marks)
Why do HCl and HNO₃ show acidic character in aqueous solutions, while alcohol and glucose do not?(PYQ 2019)
What is meant by a neutralization reaction? Give one example.
Write the chemical formulae and uses of baking soda and washing soda.
Why should curd and sour substances not be kept in brass or copper vessels?
(C) Long Answer Questions (5 Marks)
Define acids and bases. Give two examples of each from daily life. How can we identify them using indicators?
What is pH? How does the pH of soil and water affect life? Mention one example of industrial use of the pH scale.
Explain the preparation, chemical formula, and two uses each of: a) Baking soda b) Washing soda c) Bleaching powder
Describe an activity to show that acids produce hydrogen ions only in aqueous solution. What is the role of water in acid-base reactions?(PYQ 2021)
(D) HOTS (Higher Order Thinking Skills)
Why do basic solutions become less alkaline when CO₂ is passed through them? Explain with a balanced chemical equation.
In case of a bee sting (acidic), baking soda is applied. But in case of a wasp sting (alkaline), vinegar is applied. Explain why with a scientific reason.
