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MSH Practical Laboratory Series
Lab 9: Acid–Base Titration
Cambridge IGCSE Chemistry 0620
Printable Student Worksheet
Paper 5 / Paper 6 Skills
Topic: 12.2 Acid–Base Titrations | Student printable version
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Aim

To complete a practical investigation linked to 12.2 Acid–Base Titrations and develop IGCSE practical skills in observation, measurement, recording, analysis and evaluation.

Learning Objectives

Apparatus and Chemicals

Safety:

Risk Assessment Summary

Possible hazardSafety precautionEmergency response
Chemicals may irritate skin or eyes.Wear eye protection; avoid direct contact; use small quantities.Rinse affected area with plenty of water and inform the teacher.
Glassware, hot apparatus or flames may cause injury.Handle apparatus carefully; use test-tube holders; keep bags away from benches.Report breakages, burns or spills immediately.

Paper 5 / Paper 6 Practical Skills Checklist

I selected and used suitable apparatus safely.
I recorded observations and measurements clearly.
I used correct units and table headings.
I identified variables where appropriate.
I processed data or drew conclusions from evidence.
I evaluated the method and suggested improvements.

Method

  1. Rinse and fill the burette with acid.
  2. Use a pipette to transfer a measured volume of alkali into the conical flask.
  3. Add a few drops of indicator.
  4. Place the flask on a white tile.
  5. Add acid from the burette while swirling until the end-point is reached.
  6. Record the final burette reading.
  7. Repeat until concordant titres are obtained.

Results

TrialInitial burette reading / cm³Final burette reading / cm³Titre / cm³
Rough
1
2
3

Additional observations:

Analysis Questions

  1. What is the purpose of the indicator?
  2. Why is a white tile used?
  3. Why is the rough titre not usually used in the mean?
  4. Calculate the mean titre from concordant results.

Claim-Evidence-Reasoning (CER)

Claim: What happened?Evidence: What data/observations support this?Reasoning: What chemistry explains it?

Conclusion

State the mean titre and explain how reliable your results are.

Evaluation

Identify one source of error and one improvement to the method.

Source of errorImprovement

Extension / Challenge

Use the titre to calculate concentration if concentration data are provided.

Teacher Assessment (30 Marks Total)

CriterionMarks
Planning & Organisation5
Data Collection & Observations5
Processing & Analysis10
Evaluation & Improvements5
Conclusion5
Total30

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