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19H2 (2) - Name Date 1 Calculate the percent ionization of...

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Name: __________________________ Date: _____________ 1. Calculate the percent ionization of formic acid in a 0.010 M HCOOH solution. (K a = 1.7 × 10 - 4 ) 2. a. What is the optimum pH of a sodium formate/formic acid buffer? (For formic acid, K a = 1.7 × 10 - 4 ) b. Describe how to make a sodium formate (HCOONa)/formic acid (HCOOH) buffer that has a pH of 4.77. 3. What molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a pH of 5.20? (K a (C 6 H 5 COOH) = 6.5 × 10 –5 ) 4. Describe how to prepare 500. mL of a cyanic acid (HCNO)/sodium cyanate (NaCNO) buffer having a pH of 4.80. (K a (HCNO) = 2.0 × 10 - 4 ) 5. Solid sodium iodide is slowly added to a solution that is 0.0050 M Pb 2+ and 0.0050 M Ag + . (K sp (PbI 2 ) = 1.4 × 10 - 8 ; K sp (AgI) = 8.3 × 10 - 17 ) a. What compound will precipitate first? b. Calculate the Ag + concentration when PbI 2 just begins to precipitate. c. What percent of Ag + remains in solution at this point? 6. The K sp of CaF 2 is 4 × 10 - 11 . What is the maximum concentration of Ca 2+ possible in a 0.10 M NaF solution? 7. 5.0 mL of 12 M NH 3 is added to 500. mL of 0.050 M AgNO 3 . What concentration of silver ion will exist after equilibrium is established? (K f for Ag(NH 3 ) 2 + is 1.5 × 10 7 ) 8. Will a precipitate of AgCl form when 0.050 mol NaCl(s) and 0.050 mol AgNO
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