Percentage Uncertainty Calculator
Apparatus tolerances, multiple readings, cumulative titration errors, and marksheet guidelines
Apparatus Preset
Measurement Parameters
Percentage Uncertainty
0.43%
Total Absolute Uncertainty: ±0.10 cm³
Step-by-Step Mark Scheme Breakdown
Apparatus Breakdown for Volumetric Analysis
| Apparatus Stage | Measured Value | Tolerance | Readings |
|---|---|---|---|
| Mass of Standard Solid | g | ±0.01 g | 2 (difference) |
| Volumetric Flask | cm³ | ±0.30 cm³ | 1 |
| Pipette Transfer | cm³ | ±0.06 cm³ | 1 |
| Burette Mean Titre | cm³ | ±0.05 cm³ | 2 (initial/final) |
Total Cumulative Percentage Uncertainty
1.63%
Largest Error Source: Balance (0.80%)
Step-by-Step Mark Scheme Breakdown
Repeat Measurements (e.g. Titres or Temperature Rises)
Mean & Experimental Uncertainty
24.15 ± 0.05
Percentage Uncertainty: 0.21% (Range = 0.10)
Step-by-Step Mark Scheme Breakdown
Examination Advice (AQA / OxfordAQA RP01 / IB Paper 3): Examiners frequently ask candidates to explain why percentage uncertainty is reduced when a larger titre is recorded. Answer: the absolute uncertainty remains fixed at ±0.10 cm³, but dividing by a larger denominator reduces the percentage error.