Ionization Constant of a weak acid

The first graph is for run 1 which is a graph of pH of the solution against volume of sodium hydroxide added. The ionization constant that the experiment set to obtain was specifically for a weak acid.2 This means that the value of the ionization constant to be expected would be low since the acid is a weak acid. The following graphs are for both Run 1 and Run 2 for the different weak acids used. Graph for Run 1 Graph for Run 2 12.26 × 10-5 Conclusion From the calculation, the value of the ionization constant Ka = 10-4.26 × 10-5 obtained after run 1 and run 2 is a small value and this is further evidence that the acid that was chosen for the experiment is a weak acid.