The colour of phenolphthalein indicator in dilute HNO<3(aq) is
Answer Details
In dilute HNO3(aq), phenolphthalein indicator will be colorless. Phenolphthalein is a pH indicator that changes color depending on the pH of the solution it is in. In acidic solutions (pH less than 7), phenolphthalein is colorless. HNO3(aq) is a strong acid, so it will completely dissociate in water to form H+ ions, resulting in a low pH and a colorless phenolphthalein indicator.