A buffer was prepared by mixing 1.00 mole of ammonia and 1.00 mole of ammonium chloride to form an aqueous solution with a total volume of 1.00 liter. To 500 mL of this solution was added 30.0 mL of 1.00 M NaOH. What is the pH of this solution?
(a) 8.96
(b) 9.83
(c) 9.31
(d) 9.11
(e) 9.57

How many grams of NaF would have to be added to 2.00 L of 0.100 M HF to yield a solution with a pH = 4.00?
(a) 300 g
(b) 36 g
(c) 0.84 g
(d) 6.9 g
(e) 60. g

1.
Which of the following combinations cannot produce a buffer solution?
(a) HNO2 and NaNO2
(b) HCN and NaCN
(c) HClO4 and NaClO4
(d) NH3 and (NH4)2SO4
(e) NH3 and NH4Br
2.
What is the pH of a solution composed of 0.20 M NH3 and 0.15 M NH4Cl?
(a) 2.15
(b) 4.62
(c) 8.26
(d) 9.38
(e) 8.89

3.
Calculate the ratio [CH3COOH]/[NaCH3COO] that gives a solution with pH = 5.00?
(a) 0.28
(b) 0.36
(c) 0.44
(d) 0.56
(e) 0.63
4.
Consider a solution which is 0.10 M in CH3COOH and 0.20 M in NaCH3COO. Which of the following statements is true?
(a) If a small amount of NaOH is added, the pH decreases very slightly.
(b) If NaOH is added, the OH- ions react with the CH3COO- ions.
(c) If a small amount of HCl is added, the pH decreases very slightly.
(d) If HCl is added, the H+ ions react with CH3COOH ions.
(e) If more CH3COOH is added, the pH increases.

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