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Titanium is a transition element in Period 4. It is commonly found as $\mathrm{TiO}_{2}$ in minerals.

Some reactions of $\mathrm{TiO}_{2}$ are shown in Fig. 3.1.

The anion, acac $^{-}$ , is a bidentate ligand.

Fig. 3.1

Write an equation for the formation of $\mathrm{TiF}_{6}{ }^{2-}$ from $\mathrm{TiO}_{2}$ .

$\begin{aligned} \mathrm{TiO}_{2}+6 \mathrm{HF} \rightarrow \mathrm{TiF}_{6}{ }^{2-}+2 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{H}^{+} \mathrm{OR} \mathrm{TiO}_{2}+6 \mathrm{HF} \rightarrow \mathrm{TiF}_{6}{ }^{2-}+2 \mathrm{H}_{3} \mathrm{O}^{+} \end{aligned}$

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CAIE A-Level Chemistry A2 28.2.1 Ligand Reactions Forming Complexes Topic Practice

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