Identify the two “active species” in each of the following buffer systems. a. HF and LiF b. Na2HPO4 and KH2PO4 c. K2CO3 and KHCO3 d. NaNO2 and HNO2

Which of the following  constitute a buffer? A. NH3 and KNO3 B. HCN & NaCN C. HF & NaCl D. NaOH & NaCl Group of answer choices C A & C B A, B and C

Which of the following solutions is a good buffer system? A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 A solution that is 0.10 M HF and 0.10 M NaC2H3O2 + A solution that is 0.10 M HCl and 0.10 M NH A solution that is 0.10 M NaOH and 0.10 M KOH None of the above are buffer systems.

A buffer contained acetic acid, CH3COOH, sodium acetate, NaCH3COO, and sodium chloride, NaCl. Which buffer component will react with added HNO3?  A. CH3COOH B. Cl- C. Na+ D. CH3COO-

Which of the following best describes Buffers?   A. Buffers are weak acid and conjugate base pairs that resist changes in the pH of a solution. B. Buffers promote pH changes of a solution by contributing hydronium ions to the solution. C. Buffers are solutions containing a strong acid and a weak base resulting in neutralization. D. Buffers are of minimal importance to pH regulation in body fluids.

20. Which of the following pairs of solutions can form a buffer? A. 1.0 M H2SO3 and 1.0 M Na2SO3 B. 1.0 M HBr and 1.0 M KBr C. 1.0 M H2CO3 and 1.0 M NaHCO3 D. 1.0 M NaH2PO4 and 1.0 M Na3PO4

5, Which of the following pairs will not form a buffer when mixed together in an aqueous solution?   a. Na2HPO4 and KH2PO4   b. HF and NaF   c. NaCl and NaOH   d. HOCl and NaOCl   e. all of the above are buffers

Which of the following solutions is a buffer system?

#4. Which one of the following combinations can function as a buffer solution?     KCl and HCl     NaI and HI     KHSO4 and H2SO4     KOH and H2O     NaIO and HIO

Which of the following species can form buffer systems? a. NH4+ Cl－ b. CH3COOH, HC1 c. CH3COOH, CH3COONa + d. H3PO4, PO4 3－