| Date | November 2010 | Marks available | 1 | Reference code | 10N.1.hl.TZ0.26 |
| Level | HL | Paper | 1 | Time zone | TZ0 |
| Command term | Question number | 26 | Adapted from | N/A |
Question
Which mixtures act as buffer solutions?
I. \({\text{100 c}}{{\text{m}}^{\text{3}}}{\text{ 0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) ethanoic acid and \({\text{100 c}}{{\text{m}}^{\text{3}}}{\text{ 0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) sodium ethanoate
II. \({\text{100 c}}{{\text{m}}^{\text{3}}}{\text{ 0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) ethanoic acid and \({\text{50 c}}{{\text{m}}^{\text{3}}}{\text{ 0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) sodium hydroxide
III. \({\text{100 c}}{{\text{m}}^{\text{3}}}{\text{ 0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) ethanoic acid and \({\text{100 c}}{{\text{m}}^{\text{3}}}{\text{ 0.5 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) sodium hydroxide
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Markscheme
A
