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281 solutions

Buffer

Q. What is the pH of a buffer solution made by adding 0.010 mole of solid NaF to 50.0 mL of 0.40 M HF? Assume no change in volume. Ka (HF) = 6.9x10^-4. (A) 1.6 (B) 1.9 (C) 2.9 (D) 3.2

Solved • Dec 13, 2019

Buffer

Q. What is the pH of a buffer solution containing equal volumes of 0.11 M NaCH3COO an d0.090 M CH3COOH? Ka (CH3COOH) = 1.8x10^-5? (A) 2.42 (B) 4.83 (C) 11.58 (D) 13.91

Solved • Dec 13, 2019

Buffer

Q. Which pair of compounds would be the best choice to make a buffer solution with a pH around 5? (a) HF and NaF Ka = 6.9 x 10^-4 (b) C2H5CO2H and C2H5CO2Na Ka = 1.3 x 10^-5 (c) HClO and NaClO Ka = 2.8x 10^-8 (d) NH4Cl and NH3 Ka = 5.6 x 10^-10

Solved • Dec 13, 2019

Buffer

Q. What is the pH of a buffer system that contains 0.180 M hydrocyanic acid (HCN) and 0.170 M sodium cyanide (NaCN)? The pKa of hydrocyanic acid is 9.31.

Solved • Dec 8, 2019

Buffer

Q. A buffer solution contains 0.329 M NH4Br and 0.277 M NH3 (ammonia). Determine the pH change when 0.060 mol KOH is added to 1.00 L of the buffer.

Solved • Oct 26, 2019

Buffer

Q. 3. Find the pH of 200.0 mL buffer from exercise 1 after the addition of 150.0 mL of 0.020M NaOH.

Solved • Oct 2, 2019

Buffer

Q. 2. Find the pH of 100.0 mL of the buffer from exercise 1 after the addition of 0.030 mol of gaseous hydrochloric acid. Assume no volume change.

Solved • Oct 2, 2019