Correcting errors in trials

Trials conducted

Six trials were conducted, and the first three trials were deleted because the average deviation of the molarities was higher than 0.0010. The variation may be due to the error that occurred in the course of the experiment. One source of error may be that excess volume of NaOH was added in the first trial, since one was unsure of the end-point. This is evident from the volume of the first trial (36.78 ml), which was considerably higher than the rest. Consequently, the number of moles calculated in the first trial was higher than the actual volume resulting in higher deviation. The other source of error may be that the mixture was not swirled properly during the titration process. Consequently, the NaOH molecules were not well distributed towards the end-point resulting in a delay in the color change. Additionally, the oxalic acid particles may have spilled in trial two or trial three during transfer resulting in the high variation. Lastly, the error may be from an inaccurate reading of NaOH volume used for titration in the buret.

The errors can be corrected by ensuring that the first run is conducted slowly while monitoring the color change. Additionally, the mixture should be mixed well after each drop to ensure NaOH is evenly distributed. Moreover, one should also ensure that no oxalic acid spills or remains in the walls of the container during transfer. Finally, one should keenly read the lower meniscus of the buret volume to avoid inaccurate measurement. The experiment was a success as the last three trials had lower molarity variation of 0.001. The objective of the experiment was met as the average molarity of NaOH was 0.22813 M.

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