Uncertainty Analysis:

The experimental sources of errors are the weight of KHP and the volume of NaOH. For a weighing experiment, the uncertainty is ±0.0005 g per weighing. Since the net weight of KHP was obtained by difference, the error for the net weight of KHP is ±0.0010 g. The buret has an uncertainty of ± 0.05 mL per reading. The net volume of NaOH is obtained from two buret readings, therefore the net volume of NaOH is ±0.10 mL. The upper limit (UL) and lower limit (LL) for the Molarity of NaOH can be calculated as follows:

   (eqn. 6)

   (eqn. 7)

To determine if two Molarities can be averaged, the molarity from one trial must fit between the upper and lower limits of the other trial.