What color is universal indicator in a neutral solution?

What color is universal indicator in a neutral solution?

• A. Red
• B. Green
• C. Orange
• D. Purple

Answer: (B)

Universal indicator changes color as the acidity or basicity (pH) of a solution changes. It’s a blend of dyes that each respond at different pH values, so the overall color maps to a pH on a chart. The neutral point is around pH 7, and at that pH the indicator shows green. So a neutral solution appears green. Red means strongly acidic, purple indicates a strongly basic solution, and orange is more acidic than neutral, not neutral. The key idea is that color tells you the pH, and green corresponds to neutral.

Universal indicator changes color as the acidity or basicity (pH) of a solution changes. It’s a blend of dyes that each respond at different pH values, so the overall color maps to a pH on a chart. The neutral point is around pH 7, and at that pH the indicator shows green. So a neutral solution appears green. Red means strongly acidic, purple indicates a strongly basic solution, and orange is more acidic than neutral, not neutral. The key idea is that color tells you the pH, and green corresponds to neutral.