1) What volume of a 2.50 M HCl solution must be added to 500. mL of a 0.150 M CO32- solution to prepare a buffer with pH = 10.00?
(a) 20.29 mL
(b) 62.68 mL
(c) 9.71 mL
(d) 7.44 mL
2) What volume of a 3.00 M HCl solution must be added to 200. mL of a 0.200 M CO32- solution to prepare a buffer with pH = 10.30?
(a) 6.51 mL
(b) 6.82 mL
(c) 14.36 mL
(d) 13.96 mL
3) What volume of a 4.00 M HCl solution must be added to 250. mL of a 0.250 M NH3 solution to prepare a buffer with pH = 9.10?
(a) 22.59 mL
(b) 9.24 mL
(c) 6.39 mL
(d) 7.44 mL
4) What volume of 5.00 M sodium hydroxide must be added to 1.00 L of a 0.200 M acetic acid solution to prepare a buffer with pH = 4.50?
(a) 25.39 mL
(b) 14.61 mL
(c) 23.02 mL
(d) 17.63 mL
5) What volume of 4.50 M sodium hydroxide must be added to 250. mL of a 0.200 M acetic acid solution to prepare a buffer with pH = 5.00?
(a) 20.22 mL
(b) 7.17 mL
(c) 19.02 mL
(d) 3.94 mL
6) What volume of 4.50 M sodium hydroxide must be added to 250. mL of a 0.200 M nitrous acid solution to make a buffer with pH = 3.00?
(a) 7.68 mL
(b) 4.96 mL
(c) 6.77 mL
(d) 3.43 mL
7) What volume of 3.50 M potassium hydroxide must be added to 500. mL of a 0.200 M carbonic acid solution to prepare a buffer with pH = 6.30? (Assume only the first hydrogen is ionized.)
(a) 13.55 mL
(b) 12.97 mL
(c) 15.60 mL
(d) 23.76 mL