Question

What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)

Answer 1

Phenolphthalein indicator turns pink when added to an alkali.

• Phenolphthalein indicator turns from colourless to pink in contact with a basic solution. In an acidic solution, phenolphthalein remains colourless
• Alkali is a basic compound. The pH value ranges from 0 to 14.
• The pH value from 0 to 7 indicates an acidic character. The pH value from 7 to 14 indicates basic character. The pH of 7 indicates neutral nature.

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