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359 solutions

Buffer

Q. Copy of A buffer that contains 0.26 M of a base, B and 0.13 M of its conjugate acid BH+, has a pH of 8.78. What is the pH after 0.01 mol of Ba(OH)2 are added to 0.76 L of the solution?

Solved • Jul 17, 2019

Buffer

Q. Which of the following solutions is a good buffer system? A) A solution that is 0.10 M NaOH and 0.10 M KOH B) A solution that is 0.10 M HF and 0.10 M NaC2H3O2 C) A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 D) A solution that is 0.10 M HCl and 0.10 M NH4+ E) None of the above are buffer systems.

Solved • Jul 15, 2019

Buffer

Q. 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) 5.03 B) 3.34 C) 3.97 D) 4.41 E) 4.19

Solved • Jul 15, 2019

Buffer

Q. Which of the following are TRUE? A) An effective buffer has a [base]/[acid] ratio in the range of 10 - 100. B) A buffer can not be destroyed by adding too much strong base. It can only be destroyed by adding too much strong acid. C) An effective buffer has very small absolute concentrations of acid and conjugate base. D) A buffer is most resistant to pH change when [acid] = [conjugate base] E) None of the above are true.

Solved • Jul 15, 2019

Buffer

Q. A 1.0 L buffer solution is 0.050 M HC2H3O2 and 0.250 M LiC2H3O2. Which of the following actions will destroy the buffer? A) adding 0.050 moles of NaOH B) adding 0.050 moles of HCl C) adding 0.050 moles of LiC2H3O2 D) adding 0.050 moles of HC2H3O2 E) None of the above will destroy the buffer.

Solved • Jul 15, 2019

Buffer

Q. A 1.0 L buffer solution is 0.250 M HC2H3O2 and 0.050 M LiC2H3O2. Which of the following actions will destroy the buffer? A) adding 0.050 moles of HC2H3O2 B) adding 0.050 moles of NaOH C) adding 0.050 moles of HCl D) adding 0.050 moles of LiC2H3O2 E) None of the above will destroy the buffer.

Solved • Jul 15, 2019

Buffer

Q. Which of the following acids (listed with pKa values) and their conjugate base would be best to form a buffer with a pH of 8.10? A) HCN, pKa = 9.31 B) HClO2, pKa = 1.96 C) HF, pKa = 3.46 D) HClO, pKa = 7.54 E) HC7H5O2, pKa = 4.19

Solved • Jul 15, 2019