| Date | November 2016 | Marks available | 3 | Reference code | 16N.2.hl.TZ0.3 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Deduce and Explain | Question number | 3 | Adapted from | N/A |
Question
Sodium thiosulfate solution reacts with dilute hydrochloric acid to form a precipitate of sulfur at room temperature.
Na2S2O3 (aq) + 2HCl (aq) → S (s) + SO2 (g) + 2NaCl (aq) + X
(i) Using the graph, explain the order of reaction with respect to sodium thiosulfate.
(ii) In a different experiment, this reaction was found to be first order with respect to hydrochloric acid. Deduce the overall rate expression for the reaction.
Markscheme
i
first order
«because» [Na2S2O3] is «directly» proportional to rate of reaction «\(\frac{1}{{\rm{t}}}\)»
Do not accept “linear” for M2.
ii
rate = k[Na2S2O3][HCl]
Examiners report
[N/A]
Syllabus sections
Additional higher level (AHL) » Topic 16: Chemical kinetics » 16.1 Rate expression and reaction mechanism
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