OCR GCSE Chemistry B · J258
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Whether a method measures what it is intended to measure.
Revise: Titration procedureValidity means that the method is actually measuring the volume needed for the chosen acid–alkali reaction; using a suitable indicator, fresh measured samples and a clear end point helps achieve this. Results are repeatable when the same person can use the same method and equipment to obtain similar titres again. Close agreement is encouraging, although agreement alone cannot prove that every reading is accurate.
- Revise: Titration data quality
Whether a method and its data measure what the investigation is intended to measure.
- Revise: Apparatus and techniques
1 more note
- Revise: Control of variables
The extent to which an investigation tests the intended question and supports an appropriate conclusion.