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Chapter 22: Problem 122

All of the following substances are bases except for (a) \(\mathrm{H}_{2} \mathrm{NNH}_{2} ;\) (b) \(\mathrm{NH}_{3} ;\) (c) \(\mathrm{HN}_{3} ;\) (d) \(\mathrm{NH}_{2} \mathrm{OH}\); (e) \(\mathrm{CH}_{3} \mathrm{NH}_{2}\).

Short Answer

Expert verified
Therefore, the only substance among the given alternatives that is not a base is (c) \(\mathrm{HN}_{3}\).

Step by step solution

01

Identify the nitrogen compounds

In each option, we are given compounds that have nitrogen (N) in them. They are (a) \(\mathrm{H}_{2}\mathrm{NNH}_{2}\), (b) \(\mathrm{NH}_{3}\), (c) \(\mathrm{HN}_{3}\), (d) \(\mathrm{NH}_{2}\mathrm{OH}\), and (e) \(\mathrm{CH}_{3}\mathrm{NH}_{2}\).
02

Examine the nitrogen atom

Bases are substances that can donate an electron pair to an H+, a proton. The ability of these compounds to act as a base depends on the presence of a lone pair of electrons on the nitrogen atom. The nitrogen atom in options (a) \(\mathrm{H}_{2}\mathrm{NNH}_{2}\), (b) \(\mathrm{NH}_{3}\), (d) \(\mathrm{NH}_{2}\mathrm{OH}\), and (e) \(\mathrm{CH}_{3}\mathrm{NH}_{2}\) have a lone pair of electrons.
03

Identify the compound with no lone pair on nitrogen

From our analysis, we see that only in (c) \(\mathrm{HN}_{3}\), the nitrogen doesn't have a lone pair of electrons. The three hydrogen atoms are bonded to the nitrogen, and there's no additional electron pair available for bonding with a proton.

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