State how $pK_a$ is connected to acid strength.
State the formula linking $pK_a$ with the acidity constant $K_a$.
Give reasons why the $pK_a$ value for chloroethanoic acid is lower than the value for ethanoic acid.
Use the zwitterionic structure of aminoethanoic acid (glycine) in aqueous solution to write an equation showing its dissociation to give $\text{H}^+(aq)$ ions.
Calculate the pH of a $0.100\,\text{mol dm}^{-3}$ solution of aminoethanoic acid.
A $10.0\,\text{cm}^3$ portion of $0.100\,\text{mol dm}^{-3}$ aminoethanoic acid (glycine) was titrated using $0.100\,\text{mol dm}^{-3}$ NaOH. Once $20.0\,\text{cm}^3$ of NaOH, in excess, had been added, the pH was measured as 12.5. With the axes below, sketch a graph to show how the pH varies during this titration.