W10_titrations_salts_key - Chem 125 Winter 2008 Dr Retsek...

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Chem 125 Dr. Retsek Winter 2008 Worksheet 10: Titrations and Salts (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. Estimate 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. 11-12 4. For the titration of 20.00 mL of 0.150 M HF with 0.250 M NaOH.
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