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19 Nov 2019
Printed Name Pre-Lab Assignment Hydrogen Phosphate Buffer System for the This pre-lab the beginning of the lab session. masses of the conjugate acid and base needed to prepare each of the six bu sted in the table on the left. (pk, of H PO,-670) Assme the availabiliay of the phonphate salts souions I. Caliculate the Molar mass (gmoly 136.09 1742 137.99 268.09 credit KH,PO/K HPO, NaH,PO,/Na HPO KH,PO KHPO NaH,PO, 0.25 M, 100 mL 025 M, 100 mL) pli 6.50 (Solution 1) pH 650(Solution 4) pE{6.70(Solution 2, pH6.70(Solution 5) PH 690 (Solution 3) pH 690 (Solution 6) Moles of H PO Moles of HPo Solution 2 Solution 3 Solution I Grams of KH PO Grams of K HPO Solution 5 Solution 6 Solution 4 Grams of Nall,PO, H,o Grams of Na HPO, 7H,O 2 Suppose you added 2.00 mL of 0.250 M Hal to the pH 6.70 hydrogen phosphate buffer that was made in Question 1. What is the pH of the resulting buffer solution? Show all work 59
Printed Name Pre-Lab Assignment Hydrogen Phosphate Buffer System for the This pre-lab the beginning of the lab session. masses of the conjugate acid and base needed to prepare each of the six bu sted in the table on the left. (pk, of H PO,-670) Assme the availabiliay of the phonphate salts souions I. Caliculate the Molar mass (gmoly 136.09 1742 137.99 268.09 credit KH,PO/K HPO, NaH,PO,/Na HPO KH,PO KHPO NaH,PO, 0.25 M, 100 mL 025 M, 100 mL) pli 6.50 (Solution 1) pH 650(Solution 4) pE{6.70(Solution 2, pH6.70(Solution 5) PH 690 (Solution 3) pH 690 (Solution 6) Moles of H PO Moles of HPo Solution 2 Solution 3 Solution I Grams of KH PO Grams of K HPO Solution 5 Solution 6 Solution 4 Grams of Nall,PO, H,o Grams of Na HPO, 7H,O 2 Suppose you added 2.00 mL of 0.250 M Hal to the pH 6.70 hydrogen phosphate buffer that was made in Question 1. What is the pH of the resulting buffer solution? Show all work 59