How Does the Concentration of NaCl (0.00 g/mL, 0.05 g/mL, 0.10 g/mL, 0.15 g/mL, and 0.20 g/mL) in Distilled Water Affect the Density of the Solution (g/cm3) While Temperature and Volume Are Kept Constant?SL
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7
Official IB Result
IB Grade: 7
Criteria A: Research Design
6/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations for collecting data
Good
A.3Methodological considerations
Good
Criteria Feedback
- The student's research question is focused, quantitative, and clearly framed around measurable variables.
- The student places the investigation in a relevant scientific context by linking concentration, density, and prediction.
- The student's method is detailed enough that another student could broadly repeat the investigation.
- The explanation of the relationship between NaCl concentration and volume change is too weak for the level of confidence the student claims.
- Some methodological details are still ambiguous, especially how the three trials were carried out and how calibration offsets were applied.
- A few of the student's justifications are scientifically imprecise, particularly where temperature effects are explained.
Criteria B: Data Analysis
5/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Good
B.2Consideration of uncertainties
Poor
B.3Data processing quality
Moderate
Criteria Feedback
- The student's raw-data tables are clearly organised with units and uncertainty information.
- The student presents processed values, graphs, and trend fitting in a way that makes the pattern in the data easy to follow.
- The student makes a genuine attempt to think about uncertainty and to communicate the spread in the results.
- The student's uncertainty treatment is not fully aligned with the actual measurement method because it is built around derived values rather than the direct hydrometer readings.
- Some uncertainty values appear inflated or unjustified, which weakens the reliability of the processed results.
- There are precision and unit issues in the processed presentation, including inconsistent notation and some unclear slope units.
Criteria C: Conclusion
4/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and support
Good
C.2Scientific context comparison
Poor
Criteria Feedback
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Criteria D: Evaluation
6/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Suggested improvements
Moderate
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.