7. Citric acid has 3 pka's - 3.13, 4.76 and 6.40. You prepare a buffer solution by dissolving 5.00 g of dibasic ammonium

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7 Citric Acid Has 3 Pka S 3 13 4 76 And 6 40 You Prepare A Buffer Solution By Dissolving 5 00 G Of Dibasic Ammonium 1 (37.72 KiB) Viewed 62 times

7. Citric acid has 3 pka's - 3.13, 4.76 and 6.40. You prepare a buffer solution by dissolving 5.00 g of dibasic ammonium citrate [HOC(CO₂H) (CH₂CO₂NH4)2 (MW 226.18g/mol)] and 5.00g trisodium citrate dihydrate [HOC(COONa)(CH₂COONa)2- 2H₂O (MW 294.10g/mol)] in 750 mL of water. a) What is the pH of this buffer? (4 pts) b) Which component and how much (in grams) would you add to the 750mL solution from (a) to change its pH to 5.5? (assume no volume change) (4 pts) c) If you added 0.35 mL of 15M NH3 to the buffer from (a), what would be the resulting pH? (5 pts)