How does the color of phenolphthalein change when ammonia is added to it?
| April 28, 2021 | education
Ammonia is a solution of ammonia in water.
If you add a few drops of phenolphthalein to the ammonia solution. Phenolphthalein is a colorless solution. When added to ammonia, it turns crimson. Phenolphthalein, turning crimson, indicates an alkaline environment. The alkaline reaction of aqueous ammonia solutions is explained by the presence of OH- hydroxide ions:
NH3 + H2O ⇄ NH3 ⋅ H2O ⇄ NH4 + + OH−.
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