what happens if ammonia gas is passed into water containing a few drops of phenolphthalein solution?

As ammonia gas is alkaline in nature, phenolphthalein turns water pink if it is kept in water in the trough. NH 3 + H 2 O → NH 4 OH NH 4 OH ↔ NH 4+ + OH - As ammonia is dissolves in water, once a few drops of water is released inside the flask, the water rushes up due to decrease in the pressure inside the flask.

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Explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.