Question

For which type of acid base titrations would methyl orange and phenolphthalein indicator solutions be best suited?

Answer 1

In the titration of strong acid and strong base, both methyl orange and Phenaphthalein indicators are used. In this titration the endpoint lies between PH is 4 - 9.

Weak acid verses strong base , the end point lies between PH is 8 - 9. so Phenaphthelein is suitable indicator.

Strong acid verse weak base, the end point lies between PH is 6 - 4. so methyl orange is suitable indicator.

The PH range of phenolphthalein is 8.3 to 10.

The PH range of methyl orange is 3.1 to 4.4.