Apply these patterns to decide which of the oxides of tin or lead above is most likely to react with $\text{NaOH(aq)}$. In each case, give a balanced equation for the reaction.
Apply these patterns to decide which of the oxides of tin or lead above is most likely to react with $\text{HCl(aq)}$. In each case, give a balanced equation for the reaction.
'Red lead' is used as a pigment, and as a metal primer paint to prevent the corrosion of steel. It is an oxide of lead that contains $9.30\%$ oxygen by mass. Calculate to $3$ significant figures the number of moles of oxygen and lead contained in a $100.0\,\text{g}$ sample of red lead. Hence calculate its empirical formula.
Write down an expression for the solubility product, $K_{sp}$, of lead(II) chloride and state its units, given that $\text{PbCl}_2(s) \rightleftharpoons \text{Pb}^{2+}(aq) + 2\text{Cl}^-(aq)$ and $K_{sp} = 2.0 \times 10^{-5}$.
Calculate $[\text{Pb}^{2+}(aq)]$ in a saturated solution of $\text{PbCl}_2$.
An excess of $\text{PbCl}_2(s)$ is stirred with $0.50\,\text{mol dm}^{-3}$ $\text{NaCl}$ until equilibrium has been established. The excess $\text{PbCl}_2(s)$ is then filtered off. Assuming $[\text{Cl}^-]$ remains at $0.50\,\text{mol dm}^{-3}$ throughout, calculate the $[\text{Pb}^{2+}(aq)]$ in the remaining solution.
Suggest an explanation for the difference between this value and the value that you calculated in (ii).