WHAT IS THE COLOUR OF PHENOLPHTHALEIN INDICATOR IN A BASIC MEDIUM

• A. Blue
• B. Colourless
• C. Orange
• D. Pink ✓
• E. Yellow

The answer to the question is: D. Pink

Phenolphthalein is a commonly used chemical compound as an acid-base indicator. In a basic medium, phenolphthalein turns pink. This color change occurs due to the presence of hydroxide ions in the basic solution. Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions with a pH greater than 8.2. The pink coloration is a result of the ionization of phenolphthalein in the basic medium, which causes it to absorb light at a different wavelength, resulting in the observed pink color.