12. Solution to Chemistry Problem

36. A 5.00 ml sample of a mixture of hydrochloric and phosphoric acids was diluted to 200.0 ml. To titrate 20.00 ml of the resulting solution with methyl orange, 18.20 ml of 0.1012 M NaOH were used; when titrating the same sample of the solution with phenolphthalenin, 34.70 ml of the NaOH solution were used. What mass of HCl and H3PO4 was contained in 100 ml of the mixture?