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7) Preparation of buffer from solid and liquid 3 2 Attempts Partially Complete Describe how you would make 250 mL of buffer with a pH of 7.00 using Na PO,() and one of the 1.00 M solutions (HCl or NaOH) so that the concentration of the weak acid in the buffer is 0.180 M. You also have standard glassware available and deionized water. a. Which solution would you choose? HCI » 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. nacid = nHCI nbase = Ni base + nuci c. What volume of the 1.00 M solution should be introduced in the flask? 45 mL d. What mass of Na,PO () should be introduced in the flask? 2 g Evaluate Change Problem Values Extra Info