Question

What are phenolphthalein and methyl orange?

Answer 1

Methyl orange and phenolphthalein use as indicator , In Acidic solution Methyl orange gives red colour but in basic solution it gives yellow colour . In Acidic solution phenolphthalein is colourless but in basic it gives pink colour . They both are used as a pH indicator .

Answer 2

Answer:

Methyl orange and phenolphthalein is used as indicator

In Acidic solution Methyl orange gives red colour

but in basic solution it gives yellow colour .

In Acidic solution phenolphthalein is colourless but in basic it gives pink colour .

They both are used as a pH indicator .

Phenolphthalein changes colour at a pH above 7.

So it is quite good as an indicator for titrations of strong acids with strong bases. ...

Methyl orange changes colour at a suitable pH.