Phenolphthalein would not be an appropriate indicator to use to determine the ka1 of phosphoric acid why not? what indicator would be appropriate?

Phenolphthalein is a chemical compound and plays the role of a acid-base indicator. When used as an indicator with a solution with pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.

Using Phenolphthalein with phosphoric acid of pH ~3 will yield a colourless solution. Orange IV however seems fit as it would be a better indicator because it changes color around a pH of 2-3.

Explanation:

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?