IB Chemistry SL 3.1.1 Br Nsted Lowry Theory Questions

Use real SL exam questions to classify acids and bases and write proton-transfer equations using Brønsted–Lowry theory.

Exam points

Classify acids and bases using Brønsted–Lowry proton donation or acceptance in the stated reaction.
Write ionic equations showing proton transfer with correct formulas, charges and state symbols.
Distinguish an acid–base reaction from a redox reaction by checking proton transfer and changes in oxidation state.

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Study 3.1.1—Brønsted-Lowry theory conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Two hydrides of nitrogen are ammonia and hydrazine, $\mathrm{N}_{2} \mathrm{H}_{4}$ . One derivative of ammonia is methanamine whose molecular structure is shown below.

Figure for Question IB Chemistry SL 3.1.1 Br Nsted Lowry Theory Questions question 1 — IB Chemistry SL

Hydrazine reacts with water in a similar way to ammonia. Deduce an equation for the reaction of hydrazine with water.

$\mathrm{N}_{2} \mathrm{H}_{4}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{N}_{2} \mathrm{H}_{5}{ }^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})$ $\text { Accept } \mathrm{N}_{2} \mathrm{H}_{4}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{I}) \rightleftharpoons$ $\mathrm{N}_{2} \mathrm{H}_{6}{ }^{2+}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq})$ .

Equilibrium sign must be present.

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IB Chemistry SL 3.1.1 Br Nsted Lowry Theory Questions question 1