Ammonia exists as simple covalent molecules, $$$\mathrm{NH}_{3}$$$. Ammonia can react with suitable reagents to form products containing ammonium ions, $$$\mathrm{NH}_{4}^{+}$$$. Ammonia can also react with suitable reagents to form products containing amide ions, $$$\mathrm{NH}_{2}^{-}$$$. Which of these nitrogen-containing species are present in an aqueous solution of ammonia?

ammonia molecules and amide ions only

ammonia molecules and ammonium ions only

ammonia molecules only

ammonium ions only

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s17_qp_13 Year：2017 Question No：18

Answer:

Knowledge points:

12.1.1 explain the lack of reactivity of nitrogen, with reference to triple bond strength and lack of polarity

12.1.2.1 the basicity of ammonia, using the Brønsted–Lowry theory

12.1.2.2 the structure of the ammonium ion and its formation by an acid–base reaction

12.1.2.3 the displacement of ammonia from ammonium salts by an acid–base reaction

12.1.3 state and explain the natural and man-made occurrences of oxides of nitrogen and their catalytic removal from the exhaust gases of internal combustion engines

12.1.4 understand that atmospheric oxides of nitrogen (NO) can react with unburned hydrocarbons to form peroxyacetyl nitrate, PAN, which is a component of photochemical smog

12.1.5 describe the role of NO in the formation of acid rain both directly and in their catalytic role in the oxidation of atmospheric sulfur dioxide

Answer:

Knowledge points:

Solution:

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