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24 March, 14:23

Phenolphthalein would not be an appropriate indicator to use to determine the Ka1 of phosphoric acid Why not? what indicator would be appropriate?

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  1. 24 March, 14:50
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    Answer: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.
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