| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.hl.TZ2.29 |
| Level | HL | Paper | 1 | Time zone | TZ2 |
| Command term | Deduce | Question number | 29 | Adapted from | N/A |
Question
The \({K_{\text{a}}}\) values of four weak acids W, X, Y and Z are listed below.
W \({K_{\text{a}}} = 1.35 \times {10^{ - 3}}\)
X \({K_{\text{a}}} = 4.47 \times {10^{ - 2}}\)
Y \({K_{\text{a}}} = 9.33 \times {10^{ - 6}}\)
Z \({K_{\text{a}}} = 1.47 \times {10^{ - 5}}\)
What is the correct order of increasing strenght as acids?
A. X < W < Z < Y
B. W < Z < X < Y
C. Y < X < Z < W
D. Y < Z < W < X
Markscheme
D
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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