1. A bufter system a consists of a strong acid and a strong base. b. can never l

Question

1. A bufter system a consists of a strong acid and a strong base. b. can never lose its buffering capability e can maintain a fairly constant pil over a narrow range. d is none of these ch of the following substances, wben added to a solution of KF could be used to prepare a buffer solution ? a NaOH e. HF d NaF J. What is the plt of a solution that is 02 M in ammonis and 0.2 M in ammonium chloride? (K 1.8 x 10 4) a. 4.7 b. 54 c 7.0 d 8.6 e 93 4. What mast the ratio of benzoate ion (B) to benzoic acid (HB) be to prepare a buffer with a pH of 5.207 (K, 6.5 x 10's) a. 10 to1 b. 1 to l0 d. 6.5 to l e 1 to 6.5 S. Which one of the following results in a butfered solatioa when equal volumes of the two solutions are mixed? a. 0.1 MHCl and 0.1 MNHCI b. 0.1 MHCI and 0.1 MNH, c. 0.2 MHCl and 0.1 MNH, d. 0.I MHCI and 0.2 M NH 6. Assume a solution contains equal moles of HCN and NaCN. Which statement listed below is not true a. This is an example of the common ion effect b. The (H'] is larger than it would be if only the HCN were in the solution c. The [H"] is equal to the Ka d. The addition of more NaCN will shift the equilibrium for the ionization of HCN to the left. c. The addition of NaOH will increase (CN) and decrease [ICN].

Explanation / Answer

1. The right answer is option c.

A buffer system has the characteristic property of maintaining pH of the solution at a near constant value without much change. A buffer system is composed of a weak acid and it's conjugate base or vice versa( weak acid and strong base)

Examples of buffer system are carbonic acid and bicarbonate buffer system.

So right answer is option C

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