WS9 - Chem 142 Name _ Worksheet 9: Buffers, Titrations, and...

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Chem 142 Summer 2011 Page 1 of 2 Name ________________________________________ Section ________________ Worksheet 9: Buffers, Titrations, and Solubility 1. What is the pH and percent dissociation of the acid in each of the following solutions? What is the pH after 50.0 mL of 3.00 M NaOH is added to the solution? What is the pH after 80.0 mL of 4.00 M HCl is added to the original solution? Rank the buffers in order of increasing buffer capacity based on your calculations. a. 0.200 M HC 2 H 3 O 2 (K a = 1.8 x 10 -5 ) in the presence of 0.500 M NaC 2 H 3 O 2 in a total volume of 1.00 L b. 0.200 M HC 3 H 5 O 2 (K a = 1.3 x 10 -5 ) in the presence of 0.400 M NaC 3 H 5 O 2 in a total volume of 1.00 L c. 0.400 M HONH 2 (K b = 1.1 x 10 -8 ) in the presence of 0.400 M HONH 3 Cl in a total volume of 1.00 L 2. What is the mass of salt that needs to be added to 100 mL of each of the acid/base solutions to make a buffer of pH 4.50? pH 5.25? pH 6.00? a.
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WS9 - Chem 142 Name _ Worksheet 9: Buffers, Titrations, and...

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