Chemistry IA Exemplar: To what extent does the brand of calcium… | RevisionDojo

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IB Chemistry SL Internal Assessment Example

To what extent does the brand of calcium carbonate-based antacid tablet ( Rennie, Tums, Settlers, Quick Eze, and Rolaids) affect the mass of calcium carbonate per tablet, determined by back titration with 50.0 cm³ of 0.15 mol dm⁻³ HCl and 0.10 mol dm⁻³ NaOH at 25 ± 2 °C?SL

Overall Score

20/24

Criteria A: Research Design

6/6

Criteria Strands

A.1Research question context

Good

A.2Methodological considerations

Good

A.3Methodology description

Good

Criteria Feedback

You framed the investigation in a clear chemical context and identified the key variables, reagents, and back-titration approach.
You gave enough procedural detail for another student to follow the general method with only minor ambiguity.
You showed awareness of relevant methodological issues such as reaction time, repeat trials, and possible interference from other ingredients.

The research question asks for mass of calcium carbonate per tablet, but the method uses 1.000 g powder samples instead of measured tablet masses.
The design does not fully justify the assumption that magnesium hydroxide does not affect the result.
Some operational details are still not specific enough for complete reproduction, such as brand sourcing and how consistency was maintained during stirring.

Criteria B: Data Analysis

6/6

Criteria Strands

B.1Communication of data recording and processing

Good

B.2Consideration of uncertainties

Moderate

B.3Data processing quality

Poor

Criteria Feedback

You present a clear processing route from titration data to moles, mass, and percentage composition.
You include repeat data, summary statistics, error bars, and an inferential test, which shows ambition in your analysis.
Your worked example helps the reader follow the logic of the calculation.

Several processed values do not match the raw data exactly, which weakens traceability and reliability.
Your uncertainty treatment is incomplete, especially for burette readings and concentration uncertainties.
The processing does not consistently align with the original per-tablet question or fully separate calcium carbonate from other acid-neutralising ingredients.

Criteria C: Conclusion

5/6

Criteria Strands

C.1Conclusion relevance and support

Poor

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

3/6

Criteria Strands

D.1Methodological weaknesses

Good

D.2Suggested improvements

Good

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...

Overall Score

20/24

Criteria A: Research Design

6/6

Criteria Strands

A.1Research question context

Good

A.2Methodological considerations

Good

A.3Methodology description

Good

Criteria Feedback

You framed the investigation in a clear chemical context and identified the key variables, reagents, and back-titration approach.
You gave enough procedural detail for another student to follow the general method with only minor ambiguity.
You showed awareness of relevant methodological issues such as reaction time, repeat trials, and possible interference from other ingredients.

The research question asks for mass of calcium carbonate per tablet, but the method uses 1.000 g powder samples instead of measured tablet masses.
The design does not fully justify the assumption that magnesium hydroxide does not affect the result.
Some operational details are still not specific enough for complete reproduction, such as brand sourcing and how consistency was maintained during stirring.

Criteria B: Data Analysis

6/6

Criteria Strands

B.1Communication of data recording and processing

Good

B.2Consideration of uncertainties

Moderate

B.3Data processing quality

Poor

Criteria Feedback

You present a clear processing route from titration data to moles, mass, and percentage composition.
You include repeat data, summary statistics, error bars, and an inferential test, which shows ambition in your analysis.
Your worked example helps the reader follow the logic of the calculation.

Several processed values do not match the raw data exactly, which weakens traceability and reliability.
Your uncertainty treatment is incomplete, especially for burette readings and concentration uncertainties.
The processing does not consistently align with the original per-tablet question or fully separate calcium carbonate from other acid-neutralising ingredients.

Criteria C: Conclusion

5/6

Criteria Strands

C.1Conclusion relevance and support

Poor

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

3/6

Criteria Strands

D.1Methodological weaknesses

Good

D.2Suggested improvements

Good

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.