i need help for the three questions

A 24.0mL sample of 0.393M methylamine, CH3NH2, is titrated with 0.228M hydroiodic acid. After adding 18.4mL of hydroiodic acid, the pH is Use the Tables link in the References for any equilibrium constants that are required. A 21.0mL sample of 0.320M diethylamine, (C2H5)2NH, is titrated with 0.229M nitric acid. After adding 43.7mL of nitric acid, the pH is Use the Tables link in the References for any equilibrium constants that are required. A 26.5mL sample of 0.265M diethylamine, (C2H5)2NH, is titrated with 0.389M nitric acid. The pH before the addition of any nitric acid is Use the Tables link in the References for any equilibrium constants that are required. A 24.0mL sample of 0.393M methylamine, CH3NH2, is titrated with 0.228M hydroiodic acid. After adding 18.4mL of hydroiodic acid, the pH is Use the Tables link in the References for any equilibrium constants that are required. A 21.0mL sample of 0.320M diethylamine, (C2H5)2NH, is titrated with 0.229M nitric acid. After adding 43.7mL of nitric acid, the pH is Use the Tables link in the References for any equilibrium constants that are required. A 26.5mL sample of 0.265M diethylamine, (C2H5)2NH, is titrated with 0.389M nitric acid. The pH before the addition of any nitric acid is Use the Tables link in the References for any equilibrium constants that are required