Which mixture of equal volumes of the following solutions will produce a buffer solution?   A.  1.0 M CH3COOK and 0.5 M HBr   B.  0.5 M CH3COOH and 0.5 M NH4Cl   C.  1.0 M NH4Cl and 0.5 M HCl

11. Which one has the lowest concentration of H3O* ions? A. 1.0 x 101M HCI B. 1.0 x 102 M HCI В. С. C. 1.0 x 103 M HCI D. 1.0 x 104M HCI E. 1.0 x 10-SM HCI

Consider an ammonium buffer (NH4+).  Which species would react if an external base, OH- were added? a. NH4+ b. NH3 c. OH-

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

What is the pH of a buffer made by combining 45 ml of 0.15M nitrous acid and 20 ml of 0.175 M sodium nitrite a. 3.43 b. 3.64 c. 3.28 d. 3.06

Which of the following would be most effective as a buffer? A. pure water   B. a mixture of molecules that are bonded to each other with hydrogen bonds   C. a mixture of unbonded atoms   D. a mixture of molecules with ionic bonds that will break apart into ions   E. a mixture of nonpolar molecules

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

During a titration, it is found that 59.5 mL of a solution of NaOH is needed to neutralize a solution that contains 1.69 g HCL. What is the concentration of the NaOH solution?  a.) 0.3535m b.) 0. 6869m c.) 0. 7790m d.) 0. 6051m e.) 1.055m

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.

#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