BRAINCAKEExample Calculation - 3
This worked example finds the overall percentage uncertainty in a titration result.
Question: a 25.0 cm3 pipette (± 0.06 cm3) is used to transfer sodium hydroxide to a conical flask. The burette (± 0.05 cm3 per reading) reads 0.00 cm3 at the start and 23.40 cm3 at the end point. Calculate the total percentage uncertainty from the volume measurements.
Step 1: uncertainty in the titre. The titre comes from two readings, so the uncertainties add:
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Key terms in this lesson
- titre
- The volume of solution, usually read from a burette, needed to reach the end point of a titration.
More in Errors and Uncertainties
- Adding Uncertainties
- Adding Percentage Uncertainties
- Minimising Errors and Uncertainties
- Percentage Yield
- Atom Economy
- Example Calculation - 1
- Example Calculation - 2
- Example Calculation - 4
All 14 lessons in Errors and Uncertainties · All Edexcel AS-level Chemistry topics