acid - a substance that releases hydrogen ions into an aqueous solution, alkali - a base that dissolves in water, base - a substance that releases hydroxide ions, indicator - a chemical that changes colour to show whether a substance is acidic, neutral, or basic, litmus paper - a common indicator that turns red in the presence of an acid and blue in the presence of a base, pH - a scale used to measure the concentration of hydrogen ions in a solution,

Unit 1 Glossary - Part 3: Acids and Bases

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