A mixed aqueous solution of HCl and phosphorous acid (H3PO3; Ka1 = 3.00×10-2; Ka2 = 1.66×10-7) is titrated with 0.1000-M NaOH. The first end point (cresol purple indicator) is reached after 32.47 mL of NaOH has been added. The second end point (thymol blue indicator) is reached after a total of 50.61 mL of NaOH has been added. What quantity of HCl (units of mol or mmol) was present in the initial mixture?
