2022 IB Diploma Extended Essays

3. Results and Analysis

3.1 Data Collection Raw data table 1: Volume of 0.1M NaOH used to neutralise the white wine in a titration with Phenolphthalein pink indicator Trial Starting volume ( ± 0.1ml) Ending volume ( ± 0.1ml) Total volume used ( ± 0.2ml) 1 0.00 12.2 12.2 2 12.6 24.4 11.8 3 24.8 35.8 11.0 4 35.8 47.5 11.7 5 0.00 11.2 11.2 6 34.5 46.3 11.8 Reasoning for error: To measure the volume of NaOH put into the wine, the burette with a 0.1ml uncertainty was used. As the burette was only read once for the starting volume and once for the ending volume, the uncertainty is 0.1ml. Sample calculation for the total volume used: = − =0 ± 0.1 − 12.2 ± 0.1 =12.2 ± 0.2 Raw data table 2: Volume of NaOH used to neutralise the white wine in a titration with Bromothymol indicator Trial Starting volume ( ± 0.1ml) Ending volume ( ± 0.1ml) Volume used ( ± 0.2ml) 1 0.00 11.5 11.5 2 11.5 22.1 10.6 3 23.8 35.4 11.6 4 35.6 47.1 11.5 5 0.00 11.3 11.3 6 11.3 22.4 11.1 Reasoning for error: To measure the volume of NaOH put into the wine, the burette with a 0.1ml uncertainty was used. As the burette was only read once for the starting volume and once for the ending volume, the uncertainty is 0.1ml. For the sample calculation of the total volume used and the calculation for the uncertainty, refer to raw data table 1.