The butyric acid, HC4H7O2, and the Hydrazoic acid, HN3, are both weak monophonic acids. Their pKa values are 4.72 and 4.8respectively. Determine the butyric acid in a solution in which thestoichiometric concentrations of HN3 and HC4H7O2 are 0.121 mol/Land 1.83 * 10^-6 mol/L correspondingly.