1B-S10-Quiz-5-v1

1B-S10-Quiz-5-v1 - 2 You have 400 mL of a buffer that is...

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Quiz 5 Name: Chem 1B, Spring 10 Fossum H 3 PO 4 K a1 = 7.5 × 10 -3 , K a2 = 6.2 × 10 -8 , K a3 = 4.2 × 10 -13 NH 3 K b = 1.8 × 10 -5 K w = 1.0 × 10 -14 K a × K b = K w 1. 25.0 mL of 0.300 M NH 3 is titrated with 0.200 M HBr. a. (1) What is the pH at the halfway point in this titration? b. (2) Determine the pH at the 1 / 3 of the way point (where 1 / 3 of the original has reacted). c. (7) Calculate the pH at the equivalence point in this titration.
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Unformatted text preview: 2. You have 400. mL of a buffer that is 0.10 M in H 2 PO 4-and 0.40 M in HPO 4 2-. a. (1) What is the pH of this buffer? b. (6) What volume of 3.00 M HBr (aq) or 3.00 M KOH (aq) (specify which) would be needed to change the pH of this buffer to 7.10? c. (3) What mass of NaH 2 PO 4 or Na 2 HPO 4 would be needed to change the pH of the original buffer to 7.10?...
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1B-S10-Quiz-5-v1 - 2 You have 400 mL of a buffer that is...

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