15) Calculate the pH of a buffer that is 0.225 M HC2H3O2 and 0.162 M KC2H3O2. The Ka for HC2H3O2 is 1.8 × 10-5. A) 4.89 B) 9.11 C) 4.74 D) 9.26 E) 4.60
16) A 1.00 L buffer solution is 0.150 M in HC7H5O2 and 0.250 M in LiC7H5O2. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HC7H5O2 is 6.5 × 10-5. A) 4.19 B) 5.03 C) 4.41 D) 3.34 E) 3.97
17) Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] (Use- table 17.5 and the approximation approach)
Answer:
18) You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? [Ka = 1.8 × 10-5] (Use the Henderson-Hasselbach Equation) (Use table 17.5 if necessary)