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Buffer

Q. What is the new pH of a solution if 10.0 ml of 0.10 M HCl is added to 150 ml of a buffer system that is 0.10 M Benzoic acid and 0.10 M sodium benzoate. (The Ka of benzoic acid is 6.3 x 10-5)

Solved • Apr 13, 2020

Buffer

Q. 2. Lactic acid (which has the IUPAC name 2-hydroxypropanoic acid) has Ka = 1.4 x 10-4 . What is the pH of 100.0 mL of solution that is 0.12 M in lactic acid and 0.080 M in sodium lactate? Show your work. You may use “LacH” and “Lac-“ as abbreviations for lactic acid and lactate, if you wish. (You may wish to review the benzoic acid/sodium benzoate problem in Acid-base video 7.)

Solved • Apr 13, 2020

Buffer

Q. Calculate the pH of a solution made by dissolving 1.5 grams of sodium acetate (CH3COONa) into 250 ml of 0.045 M acetic acid (CH3COOH); the Ka of acetic acid is 1.8 x 10-5

Solved • Apr 13, 2020

Buffer

Q. What volume of 0.010 M NaOH must be added to a 100 ml solution that is a mixture of 0.010 M NaHCO3 and 0.010 M Na2CO3 in order to completely eliminate its buffering properties?

Solved • Apr 13, 2020

Buffer

Q. A buffer solution is made by dissolving 0.230moles of sodium hypochlorite in 1.00 L of 0.220 M hypochlorous acid(Ka= 2.9 ́10–8). What is the pH of the solution after 0.0100 moles of sodium hydroxide is added? A.6.404 D.7.578 B.6.520. E.7.596. C.7.480

Solved • Apr 12, 2020

Buffer

Q. What is the pH of a solution prepared by mixing 550.0 mL of 0.703 M CH3COOH with 460.0 mL of 0.905 M NaCH3COO? The Ka of acetic acid is 1.76 ́10–5. Assume volumes are additive. A.4.644. D.4.786 B.4.722 E.4.864. C.4.754

Solved • Apr 12, 2020

Buffer

Q. What is the pH of a solution prepared by dissolving 4.50 g sodium dihydrogen borate (83.82g/mol) in 650 mL of a 0.0725 M boric acid solution (Ka= 5.4 ́10–10). Ignore any changes in volume. A.9.27. D.9.40. B.9.21. E.9.32. C.9.14

Solved • Apr 12, 2020