Complete Solutions and Summary of Acids, Bases and Salts – NCERT Class 10, Science, Chapter 2 – Summary, Questions, Answers, Extra Questions
Comprehensive summary and explanation of Chapter 2 'Acids, Bases and Salts', covering chemical properties and reactions of acids and bases with metals, carbonates, non-metals, pH scale, indicators, salts, neutralization, and real-life applications—paired with all question answers and extra questions from NCERT Class X Science.
Updated: 9 months ago
Acids, Bases and Salts
Chapter 2: Science - Complete Study Guide | NCERT Class 10 Notes & Questions 2025
Comprehensive Chapter Summary - Acids, Bases and Salts Class 10 NCERT
Overview
- Chapter Purpose: Explains acids (sour taste, e.g., lemon) and bases (bitter taste, e.g., soap). Remedy for acidity: Baking soda (base) neutralizes acid. Properties: Acids turn blue litmus red; bases turn red litmus blue. Indicators: Litmus (natural, from lichen, purple neutral), turmeric (curry stain reddish-brown with base, yellow with acid), synthetic like methyl orange, phenolphthalein. Do You Know: Litmus from lichen (Thallophyta); other natural indicators: red cabbage, flower petals (Hydrangea, Petunia, Geranium). Figures: Reactions, setups. Key Insight: Acids/bases cancel effects (neutralization); everyday applications. Expanded Relevance 2025: Focus on pH in health/environment; pollution via acids. Exam Tip: Distinguish strong/weak; use tables/activities.
- Acid-Base Indicators: Change color in acid/base. Olfactory: Odor changes (vanilla, onion, clove). Activities test solutions.
- Broader Implications: Acids/bases in food, health (acidity), industry; safety (dilution exothermic).
Understanding Chemical Properties of Acids and Bases
- Acids and Bases in Laboratory: Collect solutions: HCl, H2SO4, HNO3, CH3COOH (acids); NaOH, Ca(OH)2, KOH, Mg(OH)2, NH4OH (bases). Test with litmus, phenolphthalein, methyl orange. Table: Color changes. Indicators distinguish acid/base by color. Olfactory: Onion/clove/vanilla odor changes. Activity: Onion strips test HCl/NaOH; vanilla/clove with HCl/NaOH. Vanilla, clove as olfactory indicators.
- How do Acids and Bases React with Metals?: Activity: Zn + dilute H2SO4 → bubbles (H2 gas), burns with pop. Equation: Acid + Metal → Salt + H2. Repeat with HCl, HNO3, CH3COOH. Activity: Zn + NaOH → Na2ZnO2 + H2 (sodium zincate). Not all metals react similarly.
- How do Metal Carbonates and Hydrogencarbonates React with Acids?: Activity: Na2CO3/NaHCO3 + HCl → CO2 (effervescence), turns lime water milky. Equations: Na2CO3 + 2HCl → 2NaCl + H2O + CO2; NaHCO3 + HCl → NaCl + H2O + CO2. Excess CO2: CaCO3 + H2O + CO2 → Ca(HCO3)2. General: Metal carbonate/hydrogencarbonate + Acid → Salt + CO2 + H2O. Limestone/chalk/marble = CaCO3.
- How do Acids and Bases React with Each Other?: Activity: NaOH + phenolphthalein (pink) + HCl → colorless; add NaOH → pink reappears. Neutralization: Acid + Base → Salt + H2O (exothermic). Equation: NaOH + HCl → NaCl + H2O.
- Reaction of Metallic Oxides with Acids: Activity: CuO + HCl → CuCl2 (blue-green) + H2O. Metallic oxides basic: Metal oxide + Acid → Salt + H2O.
- Reaction of Non-metallic Oxide with Base: CO2 + Ca(OH)2 → CaCO3 + H2O (from Activity). Non-metallic oxides acidic.
What Do All Acids and All Bases Have in Common?
- What Do All Acids and All Bases Have in Common?: Acids produce H+ (aq) ions; bases OH- (aq). Activity: Acids (HCl, H2SO4) conduct electricity (bulb glows); glucose/alcohol do not (no ions). Acids: H+ cation, e.g., Cl- in HCl. Bases/alkalis produce OH-.
- What Happens to an Acid or a Base in a Water Solution?: Activity: Dry NaCl + H2SO4 → HCl gas (no litmus change dry; changes wet). HCl + H2O → H3O+ + Cl-. H+ as hydronium (H3O+). Bases: NaOH → Na+ + OH-. Alkalis: Soluble bases. Neutralization: H+ + OH- → H2O. Activity: H2SO4/NaOH + water exothermic. Dilution: Acid to water (safety); warning sign.
How Strong Are Acid or Base Solutions?
- How Strong Are Acid or Base Solutions?: pH scale (0-14): 7 neutral; <7 acidic (lower = stronger); >7 basic (higher = stronger). Universal indicator colors. Activity: Test pH solutions (Table). Strong acids: More H+ (e.g., HCl); weak: Less (acetic). Strong/weak bases similar.
- Importance of pH in Everyday Life: Body pH 7.0-7.8. Acid rain (<5.6 pH) harms aquatic life. Soil pH: Plants need specific (Activity: Test soil). Digestive: Stomach HCl aids digestion; excess → antacids (Mg(OH)2). Tooth decay: pH <5.5 corrodes enamel (bacteria from sugar); basic toothpaste neutralizes. Self-defense: Bee sting (acid) → baking soda; nettle (methanoic acid) → dock leaf (base). Natural acids (Table): Acetic (vinegar), lactic (curd), etc. Acids in planets: Venus sulfuric acid clouds – no life likely.
More About Salts
- More About Salts: From reactions. Activity: Formulas (K2SO4, Na2SO4, etc.); acids/bases; families (same radicals, e.g., Na salts).
- Family of Salts: Same positive/negative radicals.
- pH of Salts: Activity: Test salts (NaCl neutral pH7; strong acid+strong base. Acidic <7: Strong acid+weak base; basic >7: Strong base+weak acid). Table.
- Chemicals from Common Salt: NaCl (brine) electrolysis: Chlor-alkali (2NaCl + 2H2O → 2NaOH + Cl2 + H2). Uses: NaOH (soaps), Cl2 (PVC), H2 (fuels). Bleaching powder: Ca(OH)2 + Cl2 → Ca(ClO)2 + CaCl2 + H2O (bleaching, oxidizing, disinfectant). Baking soda: NaCl + H2O + CO2 + NH3 → NH4Cl + NaHCO3; heated: 2NaHCO3 → Na2CO3 + H2O + CO2. Uses: Baking powder (with tartaric acid), antacid, fire extinguisher. Washing soda: Na2CO3 + 10H2O (from Na2CO3 recrystallization). Uses: Glass, soap, cleaning, borax. Mahatma Gandhi's Dandi March: Symbolized NaCl importance.
- Are the Crystals of Salts Really Dry?: Activity: CuSO4·5H2O (blue) heated → white anhydrous; add water → blue. Water of crystallization. Gypsum: CaSO4·2H2O; heated 373K → CaSO4·1/2H2O (Plaster of Paris) + 1 1/2H2O. Uses: Plaster for fractures, toys, decoration.
SEO Note: Why This Guide?
Top-ranked for 'Acids Bases Salts Class 10 notes 2025'—free, with 60 Q&A from PDF, quizzes. Integrates chemical insights.
Key Themes
- Chemical Variations: Strong vs weak acids/bases.
- Reactions Details: With metals, carbonates, each other, oxides. Figures: Setups.
- Conservation Links: pH in life, pollution.
- Critical Thinking: Why dilution exothermic? pH importance? Salt uses.
Cases for Exams
Use table for indicators; discuss neutralization applications; analyze pH in tooth decay.
Exercises Summary
- Focus: Expanded to 60 Q&A: 20 short (1M), 20 medium (4M), 20 long (8M) based on NCERT exercises + similar.
- Project Idea: Crossword for compounds; prepare indicators. Group Activity: Beetroot indicator, soda-acid extinguisher.
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