Question #c3d97

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Question #c3d97

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Answer 1 · 2016-05-09T10:15:09

Ammonia is a compound , but the word "ammonium" relates only to the positive ion ( $N H_{4}^{+}$ $NH_4^+$ )

Explanation:

Ammonia relates to the compound $N H_{3}$ $NH_3$ , whether it is in the gaseous state, or liquefied - but we're talking about the pure substance $N H_{3}$ $NH_3$ here, not a solution or mixture with anything else.

When ammonia is mixed with water, however, it deprotonates the water to a small extent, forming the ions $N H_{4}^{+}$ $NH_4^+$ + and $O H^{-}$ $OH^-$ as follows: $N H_{3} + H_{2} O ⇌ N H_{4}^{+} + O H^{-}$ $NH_3 + H_2O ⇌ NH_4^+ + OH^−$

$N H_{4}^{+}$ $NH_4^+$ ions are known as " ammonium ions ", so the solution of ammonia in water (commonly called "household ammonia" or "ammonia solution") should really be referred to as " ammonium hydroxide ".

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