| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.hl.TZ1.27 |
| Level | HL | Paper | 1 | Time zone | TZ1 |
| Command term | Identify | Question number | 27 | Adapted from | N/A |
Question
For which equilibrium can an expression for a base dissociation constant, \({K_{\text{b}}}\), for the forward reaction be written?
A. \({\text{N}}{{\text{H}}_3} + {{\text{H}}_3}{{\text{O}}^ + } \rightleftharpoons {\text{NH}}_4^ + + {{\text{H}}_2}{\text{O}}\)
B. \({{\text{F}}^ - } + {{\text{H}}_2}{\text{O}} \rightleftharpoons {\text{HF}} + {\text{O}}{{\text{H}}^ - }\)
C. \({\text{NH}}_4^ + + {\text{O}}{{\text{H}}^ - } \rightleftharpoons {\text{N}}{{\text{H}}_3} + {{\text{H}}_2}{\text{O}}\)
D. \({\text{HF}} + {\text{O}}{{\text{H}}^ - } \rightleftharpoons {{\text{H}}_2}{\text{O}} + {{\text{F}}^ - }\)
Markscheme
B
Examiners report
[N/A]
Syllabus sections
Additional higher level (AHL) » Topic 18: Acids and bases » 18.2 Calculations involving acids and bases
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