Describe how you would make 250 mL of buffer with a pH of 7.00 using Na3PO4(s) and one of the 1.00 M solutions (HCI or NaOH) so that the concentration of the weak acid in the buffer is 0.130 M. You also have standard glassware available and deionized water. a. Which solution would you choose? b. What are the number of moles of the weak acid and its conjugate base after the addition of the 1.00 M solution? ni, base the initial number of moles of phosphate ions in the flask. c. What volume of the 1.00 M solution should be introduced in the flask? 10.238 mL d. What mass of Na3PO4(s) should be introduced in the flask? 1