Chemistry — Acids, Bases and Salts
Overview
Acids, Bases and Salts form a foundational chapter in upper-primary chemistry, appearing consistently in KAR TET Paper II. This topic bridges everyday experiences (lemon sourness, soap slipperiness, baking soda in cooking) with core chemical concepts. Questions typically test identification of acids and bases using indicators, understanding neutralisation reactions, and recognising common salts along with their uses.
For the TET examination, mastery requires three things: recognising the characteristic properties that distinguish acids from bases, understanding how indicators work to identify these substances, and knowing the products and applications of neutralisation reactions. The topic also connects to environmental science (acid rain, soil pH) and biology (digestion, pH of blood), making it a cross-curricular favourite for examiners.
Students must move beyond rote memorisation to understand *why* acids taste sour, *why* bases feel soapy, and *why* neutralisation produces salt and water. This conceptual clarity helps answer application-based questions that form a significant portion of TET science pedagogy.
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Key Concepts
- **Acids** are substances that release hydrogen ions (H⁺) in water, taste sour, turn blue litmus red, and react with metals to produce hydrogen gas. Examples: hydrochloric acid (HCl), sulphuric acid (H₂SO₄), citric acid, acetic acid (vinegar).