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Buffer

Q. Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 200.0 mL of 0.12 M NH3. The Kb for NH3 is 1.8 × 10-5. A. 9.06 B. 9.45 C. 4.74 D. 4.55 E. 9.26

Solved • Jul 13, 2019

Buffer

Q. Which of the following acids should be used to prepare a buffer with a pH of 5.5? A. C5H5O5COOH, Ka = 4.0 x 10–6 B. C6H4(COOH)2, Ka = 2.9 x 10–4 C. CH3COOH, Ka = 1.8 x 10–5 D. HBrO, Ka = 2.3 x 10–9 E. HOC6H4OCOOH, Ka = 1.0 x 10–3

Solved • Jul 13, 2019

Buffer

Q. What is the pH of a buffer formed by dissolving 10.0 g of Na2CO3(s) and 10.0 g of NaHCO3(s) in 100.0 mL of H2O?

Solved • Jul 13, 2019

Buffer

Q. Benzoic acid (HC7H5O2) is an organic acid with a Ka value of 6.3 x 10^-5. Calculate the pH of a buffer containing 0.089 M benzoic acid and 0.17 M sodium benzoate (NaC7H5O2).

Solved • Jul 10, 2019

Buffer

Q. Determine the pH of a buffered solution containing 0.10 M chloroacetic acid and 0.20 M sodium chloroacetate. The pKa of chloroacetic acid at 25°C is 2.89.

Solved • Jul 10, 2019

Buffer

Q. Describe the possible components of a buffer solution. (Select all that apply.) a. weak acid only b. weak base only c. weak base and its conjugate acid d. strong acid and its conjugate base e. strong base and its conjugate acid f. strong acid and strong base g. weak acid and its conjugate base

Solved • Jul 10, 2019

Buffer

Q. Calculate the pH when 1.28 g of HCOONa (FW = 68.01 g/mol) is added to 29 mL of 0.50 M of formic acid, HCOOH (FW = 46.03 g/mol). Ignore any changes in volume. The Ka value for HCOOH is 1.8 x 10^-4.

Solved • Jul 8, 2019