Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an important compound in industry and agriculture. pKa1 = 1.30, pKa2 = 6.70. Calculate the pH for each of the points in the titration of 50.0 mL of 2.7 M H3PO3(aq) with 2.7 M KOH(aq). A molecule of phosphorous acid. A central phosphorus atom is single bonded to a hydrogen atom and two OH groups. An oxygen atom is also double bonded to the phosphorus atom.
Before addition of any KOH:
After addition of 25.0 mL KOH:
After addition of 50.0 mL KOH:
After addition of 75.0 mL KOH:
After addition of 100.0 mL KOH: