State the mathematical expressions for pH and $K_w$.
Calculate the pH for $0.027\,\text{mol dm}^{-3}$ $\text{NaOH}$(aq).
For chloric(I) acid, $\text{HClO}_2$, the $K_a$ value is $3.72 \times 10^{-8}\,\text{mol dm}^{-3}$. Calculate the pH of $0.010\,\text{mol dm}^{-3}$ $\text{HClO}_2$(aq).
When water and octan-1-ol are mixed, they separate into two layers. Ethanamide is more soluble in water than it is in octan-1-ol. After $1.00\,\text{g}$ of ethanamide is added to $50.0\,\text{cm}^3$ of water and the mixture is then shaken with $50.0\,\text{cm}^3$ of octan-1-ol, it is found at equilibrium that the water layer contains $0.935\,\text{g}$ of ethanamide. Calculate the partition coefficient, $K_{pc}$, for ethanamide in water and octan-1-ol.
The $50.0\,\text{cm}^3$ of water containing $0.935\,\text{g}$ of ethanamide is then shaken with $100.0\,\text{cm}^3$ of pure octan-1-ol under the same conditions. Calculate the mass of ethanamide that is dissolved in the $100.0\,\text{cm}^3$ of octan-1-ol at equilibrium.