Chemistry IA Exemplar: How does the mass of powdered ascorbic acid… | RevisionDojo

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IB Chemistry SL Internal Assessment Example

How does the mass of powdered ascorbic acid added to a fixed volume of simulated gastric fluid affect the percentage of ascorbic acid dissolved until the permanent blue starch–iodine endpoint appears, as determined by iodine titration at room temperature?SL

Official IB Result

IB Grade: 6

Criteria A: Research Design

6/6

Criteria StrandsPro

A.1Research question context

Good

A.2Methodological considerations

Moderate

A.3Methodology description

Poor

Criteria Feedback

The student states a focused research question that identifies the independent and dependent variables clearly.
The student gives a relevant real-world context for why the investigation matters.
The student includes several important practical considerations such as repeats, controlled variables, and safety.

The context is still broad and includes some scientifically weak assumptions.
The method does not fully separate dissolution from the titration process.
Some key procedural details are missing, which makes the investigation hard to reproduce exactly.

Criteria B: Data Analysis

6/6

Criteria StrandsPro

B.1Communication of data recording and processing

Moderate

B.2Consideration of uncertainties

Moderate

B.3Data processing quality

Poor

Criteria Feedback

The student uses a sensible titration-based processing approach and shows that they understand the stoichiometric link between iodine and ascorbic acid.
The student presents repeated measurements, means, standard deviations, and graphs with error bars.
The student's processing is generally traceable and the main numerical trends can be followed.

The chemical interpretation of the redox process is not fully correct.
The analysis does not fully account for uncertainty or explain what the error bars represent.
The calculated values are limited by the fact that the method mixes dissolution with reaction during titration.

Criteria C: Conclusion

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

4/6

Criteria StrandsPro

D.1Methodological weaknesses

Moderate

D.2Suggested improvements

Moderate

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.

Loading scores...

Official IB Result

IB Grade: 6

Criteria A: Research Design

6/6

Criteria StrandsPro

A.1Research question context

Good

A.2Methodological considerations

Moderate

A.3Methodology description

Poor

Criteria Feedback

The student states a focused research question that identifies the independent and dependent variables clearly.
The student gives a relevant real-world context for why the investigation matters.
The student includes several important practical considerations such as repeats, controlled variables, and safety.

The context is still broad and includes some scientifically weak assumptions.
The method does not fully separate dissolution from the titration process.
Some key procedural details are missing, which makes the investigation hard to reproduce exactly.

Criteria B: Data Analysis

6/6

Criteria StrandsPro

B.1Communication of data recording and processing

Moderate

B.2Consideration of uncertainties

Moderate

B.3Data processing quality

Poor

Criteria Feedback

The student uses a sensible titration-based processing approach and shows that they understand the stoichiometric link between iodine and ascorbic acid.
The student presents repeated measurements, means, standard deviations, and graphs with error bars.
The student's processing is generally traceable and the main numerical trends can be followed.

The chemical interpretation of the redox process is not fully correct.
The analysis does not fully account for uncertainty or explain what the error bars represent.
The calculated values are limited by the fact that the method mixes dissolution with reaction during titration.

Criteria C: Conclusion

3/6

Criteria StrandsPro

C.1Conclusion relevance and support

Moderate

C.2Scientific context comparison

Poor

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.

Criteria D: Evaluation

4/6

Criteria StrandsPro

D.1Methodological weaknesses

Moderate

D.2Suggested improvements

Moderate

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.