Edexcel A-Level Chemistry A2 17.23 Write Ionic Equations to Show the Meaning of Amphoteric Behaviour Deprotonation and Ligand Exchange in the Reactions Questions

Practise Edexcel IAL Chemistry 17.23 by recognising hydroxides soluble in acid and alkali, writing hydroxo-complex equations and distinguishing deprotonation from ammonia ligand exchange.

Exam points

Recognise amphoteric hydroxides dissolving in both strong acid and strong alkali.
Write zinc or chromium hydroxide equations that form soluble hydroxo complexes.
Distinguish deprotonation from ligand exchange in NaOH and NH3 reactions.

[Maximum number: 2]

This question is about transition metals and their compounds.

Three reactions were carried out on a solution containing $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ ions.

Figure for Question Edexcel A-Level Chemistry A2 17.23 Write Ionic Equations to Show the Meaning of Amphoteric Behaviour Deprotonation and Ligand Exchange in the Reactions Questions question 1 — Edexcel A-Level Chemistry A2

Complete the equation for Reaction 1. State symbols are not required.

\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+\ldots \ldots \ldots \ldots \ldots \mathrm{NH}_{3} \rightarrow

correct formula of iron(III) hydroxide

(1)

- rest of equation correct, conditional on correct precipitate

(1)

Examples of equation:
$\begin{aligned} & {\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{NH}_{3} \rightarrow \mathrm{Fe}(\mathrm{OH})_{3}+3 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{NH}_{4}^{+}} & \begin{array}{l} \mathrm{Ir} {\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{NH}_{3} \rightarrow \mathrm{Fe}(\mathrm{OH})_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}+3 \mathrm{NH}_{4}^{+}} \end{array} \end{aligned}$

Allow $\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}(\mathrm{OH})_{3}$

Ignore state symbols, even if incorrect Ignore square brackets around iron(III) hydroxide formulae

(2)

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Edexcel A-Level Chemistry A2 17.23 Write Ionic Equations to Show the Meaning of Amphoteric Behaviour Deprotonation and Ligand Exchange in the Reactions Questions question 1