The solubility of iron(II) hydroxide, $$\(\mathrm{Fe}(\mathrm{OH})_{2}\)$$, is $$\(5.85 \times 10^{-6} \mathrm{moldm}^{-3}\)$$ at 298 K . (i) Write the expression for the solubility product, $$\(K_{\mathrm{sp}}\)$$, of $$\(\mathrm{Fe}(\mathrm{OH})_{2}\)$$. $$\[ K_{\mathrm{sp}}= \]$$ (ii) Calculate the value of $$\(K_{\mathrm{sp}}\)$$ of $$\(\mathrm{Fe}(\mathrm{OH})_{2}\)$$. Include its units. $$\[ \begin{array}{r} K_{\mathrm{sp}}= \\ \text { units }= \end{array} \]$$ .......................... ..........................
Exam No：9701_s24_qp_41 Year：2024 Question No：1(c)
Answer:
Knowledge points:
23.1.1.1 enthalpy change of atomisation,
23.1.1.2 lattice energy, (the change from gas phase ions to solid lattice)
23.1.2.1 define and use the term first electron affinity, EA
23.1.2.2 explain the factors affecting the electron affinities of elements
23.1.2.3 describe and explain the trends in the electron affinities of the Group 16 and Group 17 elements
23.1.3 construct and use Born–Haber cycles for ionic solids (limited to +1 and +2 cations, –1 and –2 anions)
23.1.4 carry out calculations involving Born–Haber cycles
23.1.5 explain, in qualitative terms, the effect of ionic charge and of ionic radius on the numerical magnitude of a lattice energy
23.2.1 define and use the term enthalpy change with reference to hydration, and solution, Δ$\mathrm{H}_{sol}$
23.2.2 construct and use an energy cycle involving enthalpy change of solution, lattice energy and enthalpy change of hydration
23.2.3 carry out calculations involving the energy cycles in 23.2.2
23.2.4 explain, in qualitative terms, the effect of ionic charge and of ionic radius on the numerical magnitude of an enthalpy change of hydration
Solution:
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