SUMMARY: This chapter explores the chemical properties, reactions, and uses of acids, bases, and salts, along with their role in everyday life.
KEY TOPICS: properties of acids and bases, pH scale, neutralization reactions, preparation of salts, uses of acids and bases, indicators, strength of acids and bases, common salts and their uses, importance of pH in everyday life, acid rain.
Assertion (A): Acids turn blue litmus paper red.
Reason (R): Litmus is a natural indicator that changes color in acidic and basic solutions.
Assertion (A): All acids contain hydrogen ions (H+).
Reason (R): Hydrogen ions are responsible for the acidic properties of substances.
Assertion (A): Sodium hydroxide is an acid.
Reason (R): Sodium hydroxide is a strong base that dissociates in water to release hydroxide ions (OH-).
Assertion (A): Vinegar is a weak acid.
Reason (R): Vinegar contains acetic acid, which is weaker than strong acids like hydrochloric acid.
Assertion (A): All bases feel slippery to the touch.
Reason (R): The slippery feel of bases is due to their ability to react with fats and oils.
Assertion (A): Neutralization reactions produce salts and water.
Reason (R): Neutralization is the reaction between an acid and a base to form salt and water.
Assertion (A): Phenolphthalein turns pink in acidic solutions.
Reason (R): Phenolphthalein is a pH indicator that turns pink in basic solutions, not acidic.
Assertion (A): The pH scale ranges from 0 to 14.
Reason (R): The pH scale measures the acidity or basicity of a solution, with 7 being neutral.
Statement 1: Acids turn blue litmus paper red.
Statement 2: Bases turn red litmus paper blue.
Statement 1: Hydrochloric acid is a strong acid.
Statement 2: Sodium hydroxide is a weak base.
Statement 1: All acids contain hydrogen ions.
Statement 2: All bases contain hydroxide ions.
Statement 1: Vinegar is a solution of acetic acid.
Statement 2: Lemon juice is a basic solution.
Statement 1: pH scale ranges from 0 to 14.
Statement 2: A pH of 7 indicates an acidic solution.
Statement 1: Neutralization reactions produce salt and water.
Statement 2: Acids react with metals to produce hydrogen gas.
Statement 1: Sodium bicarbonate is an acid.
Statement 2: Calcium carbonate is a base.
Statement 1: The pH of pure water is 7.
Statement 2: A substance with a pH less than 7 is alkaline.
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