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357 solutions

Buffer

Q. Use the buffer equation to calculate the pH of buffer solutions prepared by dissolving the following amounts of acetic acid and sodium acetate respectively in enough water to make 1 L of solution: a) 0.67 mol acetic acid, 0.33 mol sodium acetate b) 0.33 mol acetic acid, 0.67 mol sodium acetate

Solved • Mar 29, 2020

Buffer

Q. An environmental researcher needs a carbonate buffer at pH 10.0 to study the effects of acid rain. How many grams of sodium carbonate must be added to 1.50 L of 0.200 M sodium bicarbonate to make a buffer if the Ka for sodium bicarbonate is 4.7x10-11?

Solved • Mar 29, 2020

Buffer

Q. Calculate the ph of the followijg solutions A) 0.18 M CH3NH3Cl B) a mixture of 0.18 M CH3NH2 and 0.18 M CH3NH3Cl

Solved • Mar 29, 2020

Buffer

Q. Calculate the pH of a solution that results from mixing 11 mL of 0.14 M HCN(aq) with 20 mL of 0.12 M NaCN. The Ka value for HCN is 4.9 x 10-10. Selected Answer: Incorrect 9 Correct Answer: Correct 9.50 ± 0.02

Solved • Mar 24, 2020

Buffer

Q. Calculate the pH of a solution that is 0.295 M NH3 and 0.331 M NH4Cl. Kb of NH3 is 1.8 x 10-5. Selected Answer: Incorrect [None Given] Correct Answer: Correct 9.21 ± 0.02

Solved • Mar 24, 2020

Buffer

Q. What is the buffer component ratio, (NO2-)/(HNO2) of a nitrite buffer that has a pH of 3.45. Ka of HNO2 is 7.1 x 10-4. Selected Answer: Incorrect 10 Correct Answer: Correct 2.00 ± 3%

Solved • Mar 24, 2020

Buffer

Q. A buffer that contains 0.42 M of a base, B and 0.42 M of its conjugate acid BH+, has a pH of 9.38. What is the pH after 0.02 mol of NaOH are added to 0.82 L of the solution? Selected Answer: Incorrect [None Given] Correct Answer: Correct 9.43 ± 0.02

Solved • Mar 24, 2020