This chapter explores acids, bases, and salts, focusing on their properties, reactions, and everyday applications. Understanding these concepts is crucial for practical science and daily life.
Acids, Bases and Salts - Quick Look Revision Guide
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Key Points
Define acids and bases with examples.
Acids are sour in taste and turn blue litmus red, e.g., lemon juice. Bases are bitter and turn red litmus blue, e.g., baking soda.
Explain the pH scale.
The pH scale measures acidity or alkalinity from 0 (very acidic) to 14 (very alkaline). A pH of 7 is neutral, like pure water.
Neutralization reaction formula.
Acid + Base → Salt + Water. Example: HCl + NaOH → NaCl + H2O.
Role of water in acid-base reactions.
Water is essential for acids and bases to produce H+ and OH- ions, enabling their characteristic reactions.
Common natural indicators.
Litmus, turmeric, and red cabbage are natural indicators that change color in acids and bases.
Synthetic indicators examples.
Methyl orange and phenolphthalein are synthetic indicators used in labs to test for acids and bases.
Acid + Metal reaction.
Acids react with metals to produce salt and hydrogen gas. Example: Zn + H2SO4 → ZnSO4 + H2.
Base + Metal reaction.
Some bases react with metals to produce salt and hydrogen gas. Example: 2NaOH + Zn → Na2ZnO2 + H2.
Acid + Metal Carbonate reaction.
Produces salt, water, and CO2. Example: Na2CO3 + 2HCl → 2NaCl + H2O + CO2.
Uses of bleaching powder.
Used for bleaching clothes, disinfecting water, and as an oxidizing agent in industries.
Preparation of baking soda.
NaCl + H2O + CO2 + NH3 → NH4Cl + NaHCO3. Used in cooking and as an antacid.
Uses of washing soda.
Used in glass, soap, and paper industries, and for removing water hardness.
Water of crystallization.
Fixed water molecules in salts like CuSO4.5H2O, lost on heating, restoring on adding water.
Plaster of Paris preparation.
Heating gypsum at 373K gives CaSO4.½H2O. Used for casts and molds.
pH in everyday life.
Optimal pH is crucial for digestion, plant growth, and preventing tooth decay.
Acid rain effects.
pH <5.6 harms aquatic life, buildings, and soil fertility.
Antacids function.
Neutralize excess stomach acid. Example: Mg(OH)2 + 2HCl → MgCl2 + 2H2O.
Chlor-alkali process.
Electrolysis of NaCl solution produces NaOH, Cl2, and H2, used in various industries.
Olfactory indicators.
Substances like onion and vanilla change smell in acids and bases.
Importance of dilution.
Always add acid to water slowly to prevent violent reactions and splashing.
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