Question

The conjugate base of hydrazoic acid is :

• A. $N^{-3}$
• B. $N^{-}_{3}$
• C. $N^{-}_{2}$
• D. $HN^{-}_{3}$

Answer 1

The Correct Option is A

To find the conjugate base of hydrazoic acid, we need to understand the concept of conjugate acid-base pairs. A conjugate base is formed when an acid donates a proton (H⁺) to another species. Let's identify the conjugate base of hydrazoic acid (HN₃).

Hydrazoic acid can be represented as HN₃. When it donates a proton, the reaction can be written as:

HN_{3} \rightarrow N_{3}^{-} + H^{+}

In this reaction, HN₃ donates an H⁺ ion, resulting in the formation of the azide ion, N₃^-.

Let's analyze the given options:

• N^{-3}: This represents a nitride ion, not the azide ion formed in this reaction.
• N^{-}_{3}: This is the azide ion, which is the correct conjugate base of hydrazoic acid.
• N^{-}_{2}: This does not correspond to the azide ion.
• HN^{-}_{3}: This represents a protonated azide ion, not a conjugate base.

Therefore, the correct answer is N^{-}_{3}, which is the azide ion formed when hydrazoic acid donates a proton.