Chemistry IA Exemplar: How does the initial concentration of… | RevisionDojo

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IB Chemistry HL Internal Assessment Example

How does the initial concentration of copper(II) sulfate solution affect the percentage decrease of its concentration after filtration through a fixed quantity of ion (cation)- exchange resin, as measured by its absorbance using colorimetry?HL

Official IB Result

IB Grade: 6

Criteria A: Research Design

5/6

Criteria StrandsPro

A.1Research question context

Excellent

A.2Methodological considerations

Moderate

A.3Methodology description

Moderate

Criteria Feedback

The student framed a focused, experimentally workable question with clear variables and a relevant chemical context.
The student justified the use of colorimetry in a way that connects to the copper(II) solution and the expected change during ion exchange.
The student gave enough procedural detail for another student to follow the investigation with only a few ambiguities.

Some background chemistry is less precise than it could be, especially where the explanation becomes overextended.
The wording of the measured change is not fully consistent throughout the report, which can create confusion later.
A few controls are described but not fully secured, especially residence time, flow rate, and temperature.

Criteria B: Data Analysis

3/6

Criteria StrandsPro

B.1Communication of data recording and processing

Moderate

B.2Consideration of uncertainties

Poor

B.3Data processing quality

Poor

Criteria Feedback

The student presents raw data, means, and sample calculations, which makes their processing easier to follow than if only final values were shown.
The student uses graphs and calibration work to turn raw measurements into a useful processed form.
The student makes a genuine effort to consider uncertainty by including instrument resolution, repeat measurements, and error bars.

Some processed values do not match the raw data and the stated formula consistently, which weakens confidence in the analysis.
The calibration relationship is not used consistently because the intercept is ignored when concentration is later calculated.
The uncertainty treatment is present but not fully coherent, and several relevant sources of error are not properly integrated.

Criteria C: Conclusion

2/6

Criteria StrandsPro

C.1Conclusion relevance and support

Moderate

C.2Scientific context comparison

Poor

Criteria Feedback

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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

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

5/6

Criteria StrandsPro

A.1Research question context

Excellent

A.2Methodological considerations

Moderate

A.3Methodology description

Moderate

Criteria Feedback

The student framed a focused, experimentally workable question with clear variables and a relevant chemical context.
The student justified the use of colorimetry in a way that connects to the copper(II) solution and the expected change during ion exchange.
The student gave enough procedural detail for another student to follow the investigation with only a few ambiguities.

Some background chemistry is less precise than it could be, especially where the explanation becomes overextended.
The wording of the measured change is not fully consistent throughout the report, which can create confusion later.
A few controls are described but not fully secured, especially residence time, flow rate, and temperature.

Criteria B: Data Analysis

3/6

Criteria StrandsPro

B.1Communication of data recording and processing

Moderate

B.2Consideration of uncertainties

Poor

B.3Data processing quality

Poor

Criteria Feedback

The student presents raw data, means, and sample calculations, which makes their processing easier to follow than if only final values were shown.
The student uses graphs and calibration work to turn raw measurements into a useful processed form.
The student makes a genuine effort to consider uncertainty by including instrument resolution, repeat measurements, and error bars.

Some processed values do not match the raw data and the stated formula consistently, which weakens confidence in the analysis.
The calibration relationship is not used consistently because the intercept is ignored when concentration is later calculated.
The uncertainty treatment is present but not fully coherent, and several relevant sources of error are not properly integrated.

Criteria C: Conclusion

2/6

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

5/6

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.