Chemistry 9701 · AS & A Level · 3.2

3.2 — practice question

Nickel is able to form complexes.
(a(i))[1]

State the formula and charge of the tetrahedral complex produced by Ni atoms with carbon monoxide molecules. Carbon monoxide functions as a monodentate ligand. This is complex E. $E =$ ...............

(a(ii))[2]

State the formula and charge of the octahedral complex formed by $\text{Ni}^{2+}$ ions with ethanedioate ions. This is complex F.\n\n$F =$ ...............

(a(iii))[1]

Identify which complex, E or F, appears as a mixture of two stereoisomers and state the type of stereoisomerism involved.\n\nThe complex that appears as a mixture of two stereoisomers is ............... .\n\nThe type of stereoisomerism involved is ............... .

(b(i))[1]

Explain, by reference to its structure, why $\text{CH}_3\text{NH}_2$ behaves as a monodentate ligand.

(b(ii))[1]

Some $\text{Cd}^{2+}(aq)$ is added to a solution containing equal concentrations of $\text{CH}_3\text{NH}_2$ and $en$.\n\nPredict which of the two complexes in Table 6.1 is formed at the higher concentration.\n\nExplain your answer.\n\ncomplex that forms at the higher concentration ...............\n\nexplanation ...............

(b(iii))[1]

Complete the expression for the $K_{\text{stab}}$ of $[\text{Cd}(\text{CH}_3\text{NH}_2)_4]^{2+}$.\n\n$K_{\text{stab}} =$

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: Ni(CO)4

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