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The third titration of 23.5cm³ is an anomalous result. Therefore I would not include this result or the rough result when working out the average titration. This anomalous result may have occurred due to missing the end point of the reaction, inaccurate measurements of the pipette or burette and not noticing the final colour change accurately.

Accuracy has tried to be maintained though many procedures in the method;
Weighing using a chemical balance means that the solid’s weight is correct to 2 dp.
A graduation flask has a small percentage error and it is relatively easy to see the 250cm³ mark.
Adding the same amount of methyl orange indicator each time, and using the minimum amount of indicator needed.
Recording the burette reading to 2 decimal places

To measure the accuracy of my results I am going to work out the percentage error for each apparatus I have used in experiment. To find this I have calculated it using the formula.
Percentage error = error x 100
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