W9_titrations_salts_key

W9_titrations_salts_key - Chem 125 Winter 2007 Dr. Retsek...

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Chem 125 Dr. Retsek Winter 2007 Worksheet 9: Acids and Bases and Titrations (KEY) 1. A 25.00-mL sample of 0.100 M HCl is titrated with with 0.100 M NaOH. a. What is the pH before the addition of any NaOH? pH = 1.00 b. How much NaOH is required to reach the equivalence point? 25.00 mL c. What is the pH at the equivalence point? 7.00 2. A 25.00-mL sample of 0.100 M HC 2 H 3 O 2 is titrated with 0.100 M NaOH. a. What volume of base is needed to reach the equivalence point? 25.00 mL b. At what volume, does the pH = pK a 12.5 mL c. Given K a for HC 2 H 3 O 2 is 1.8 x 10 -5 , calculate the pH before the addition of any NaOH 2.89 d. What is the pH at the equivalence point? pH > 7 3. For the titration of 25.00 mL of 0.150 M HCl with 0.250 M NaOH: a. Calculate the initial pH. 0.824 b. Is the solution neutral, acidic, or basic at the equivalence point? neutral c. How much NaOH is required to reach the equivalence point? 15.00 mL d. Estimate the pH of the solution after the addition of 25.00 mL of NaOH.
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This note was uploaded on 04/06/2008 for the course CHEM 125 taught by Professor Retsek during the Winter '08 term at Cal Poly.

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W9_titrations_salts_key - Chem 125 Winter 2007 Dr. Retsek...

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