Chemistry - Acids and Bases - Indicators and pH scale introduction - Color-Changing Chemistry

Match 6 indicators to their color changes for Grade 9-10. Pairs: 1) Litmus paper (acid) → Red. 2) Litmus paper (base) → Blue. 3) Phenolphthalein (acid) → Colorless. 4) Phenolphthalein (base) → Pink. 5) Methyl orange (acid) → Red. 6) Methyl orange (base) → Yellow. 7) Universal indicator (pH 1) → Red.