How the concentration of Na2S2O3 affects the rate of reaction with HCl and therefore determine the order of reaction with respect to sodium thiosulfate.HL
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7
Official IB Result
IB Grade: 7
Criteria A: Research Design
5/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Moderate
A.3Methodology description
Moderate
Criteria Feedback
- The student states a focused, measurable research question with a clear independent variable and a sensible kinetic aim.
- The student's background explains why the disappearing-cross method is suitable for a sulfur-forming reaction.
- The student includes practical planning choices such as repeated trials, a preliminary test, and a fixed total volume.
- The claim that hydrochloric acid is in excess is not demonstrated by the quantities used.
- Some methodological details needed for exact replication are missing or inconsistent.
- Temperature is monitored rather than controlled, which weakens experimental control.
Criteria B: Data Analysis
5/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Excellent
B.2Consideration of uncertainties
Moderate
B.3Data processing quality
Poor
Criteria Feedback
- The student presents the raw and processed data in a clear, organised way with appropriate tables and units.
- The student's use of repeated trials and mean values improves the reliability of the dataset.
- The graph, regression line, and error bars show good awareness of how to communicate processed results visually.
- The rate is treated too confidently as an absolute rate rather than a relative rate based on time to endpoint.
- The uncertainty treatment is incomplete because it underestimates the real spread in the repeated measurements.
- The processing does not fully account for the impact of the acid-dilution and excess-reactant issue on the validity of the trend.
Criteria C: Conclusion
4/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and support
Moderate
C.2Scientific context comparison
Poor
Criteria Feedback
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- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Criteria D: Evaluation
5/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Moderate
D.2Suggested improvements
Excellent
Criteria Feedback
- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.