Question

Name two substances that have different colours in acidic and basic solutions. What is the general name for such substances?

Answer 1

Phenolphthalein and methyl orange are the two substances which have a different colour in acidic and basic solutions. Phenolphthalein shows colourless in acidic and pink in basic solution. Methyl orange shows red in acidic and pink in basic solution. They both are commonly known as the indicator.