- 1 (201.06 KiB) Viewed 54 times
- 2 (119.18 KiB) Viewed 54 times
- 3 (131.07 KiB) Viewed 54 times
с D E F A B Experiment 7 - Determination of Ka and Kb 1 THE EQUILIBRIUM CONSTANT OF ACETIC ACID. 1A. pH of 0.50 M HC2H2O2 Trial 1 2.37 Trial 2 2.35 a. [H7 b. [C2H302] c. [HC2H2O2(aq)] d. Keg 1B. pH of 0.20 M HC H302 2.60 2.61 a. H7 b. [CH:02] c. [HC H3O2(aq) d. Keg 3 1C. 0.50 M HC2H2O2 and solid NaC2H2O2.3H2O grams of NaC2H2O, added pH of mixture Trial 1 0.5163 4.15 Trial 2 0.7026 4.27 a. [H] b. [CH:02] C. [HC H2O2(aq)] 0 1 2 3 4 -5 26 27 28 29 30 d. Kea D. Average the six values for Keg E. Calculate your percent error if the known Keg = 1.76 x 10-5 96
% 2 Key of an Unknown Weak Acid A. pH of 0.10 M Unknown Acid Trial 1 2.17 Trial 2 2.19 a. [H] b. [A] C. (HA(aq d. Kca B. 5 mL of 0.1 M NaOH plus 25 mL of Unknown acid a. pH of mixture 2.82 2.86 b. [H] C. [A] d. [HAaq] e. Ke C. 15 mL of 0.1 M NaOH plus 30 mL of Unknown acid a. pH of mixture 3.40 3.46 b. [H] C. [A] d. [HAaq] e. Kea D. Average the six values for Ke
3 THE EQUILIBRIUM CONSTANT OF A WEAK BASE A. pH of 0.50 M Unknown Weak Base Trial 1 9.45 Trial 2 9.41 POH a. [OH] b. [HB] c. d. Kea B. 5 mL of 0.1 M HCl plus 20 mL of 0.50 M Unknown base a. pH of mixture 5.82 5.76 pОН a. [OH) b. [HB] C. d. Kea C. Average the four values for Keq