A mixture of H3PO4 and HCl is titrated with the 0.1000 M NaOH. The first end point used methyl red as an indicator and the end point occurred at the 35.00 mL. The second end point used bromthymol blue as an indicator and occurred at a total volume of 50.00 mL (or 15.00 mL after the first end point). Determine the number of moles of H3PO4 and of HCl present in the solution. If the solution was 50.00 mL, explain what was the concentration of the H3PO4 and HCl present?