Question

WhicH indicator is colourless

Answer 1

Answer:

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

Answer 2

Answer:

• indicators Acid Colour Base Colour

1. Phenolphthalein colourless dark pink
2. Thymolphthalein colourless blue
3. Alizarin yellow R yellow red
4. Malachite green hydrochloride green-blue colourless