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Quiz

Quiz 1. A solution of H 3 PO 4 and its associated forms has a pH of 7.50 . What is the principal species? For H 3 PO 4, pK a1 = 2.148, pK a2 = 7.199, pK a3 = 12.15. Show how you came to your answer using equilibrium reactions. a. H 3 PO 4 b. H 2 PO 4 - c. HPO 4 2- d. PO 4 3-

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Quiz

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  1. Quiz 1. A solution of H3PO4 and its associated forms has a pH of 7.50. What is the principal species? For H3PO4, pKa1 = 2.148, pKa2 = 7.199, pKa3 = 12.15. Show how you came to your answer using equilibrium reactions. a. H3PO4 b. H2PO4- c. HPO42- d. PO43- 2. In problem 1 above, what is the second most abundant species? a. H3PO4 b. H2PO4- c. HPO42- d. PO43-

  2. Quiz 3. How many mL of 0.250 M HCl need to be added to 20.0 mL of 0.350 M acetate to reach the equivalence point? Show your work. a. 14.0 mL b. 20.0 mL c. 28.0 mL d. none of the above 4. Consider the titration of a weak acid whose pKa is 7.7. What is the pH of the titration half way to the equivalence point? a. 7.7 b. 6.3 c. 7.0 d. more information is necessary

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