6.03 Calorimetry Lab

In the first week of the experiment, the goal was to find the moles of NaOH, as well as a 0.1 molarity, while in the second week to goal was to determine the percent KPH in the sample. The first week titrations were successful and had very similar amounts of pink, which shows the precision of the results. The best trials were in the sample trial and the second and third trials. The average molarity calculated for the first week was 0.1017 M. This very close to the 0.1 M that was supposed to be made. The standard deviation in the average molarity was 8.9710-4 M. and for the percent variation in average molarity it was 88%. The standard deviation illustrates the percision of the experiment for week one. Being that it is so low, it shows how consistent the results that were taken were. The percent variation shows the accuracy, which was below the 1% maximum. Since the results were both percise and accurate, this shows that the results are reliable
The goal was to use the known molarity value of 0.1017 M 8.9710-4M to determine what the percent KHP was in the unknown mixture. In these trials, the colors did vary a little more than in the first week. Trials 1, 2, and 3 were used to get the most accurate results. The average mass of KHP in the sample was 30.705%, and the standard deviation of the average percent KHP was 0.58259. However, the percent variation in the average percent KHP was 1.8%. This percent variation was much higher than was expected and was only allowed because the accuracy of the experiment was very good. The actual percentage of KHP in the sample (given by the instructor) was 30.48%, while the calculated percentage was 30.705%. The percent error was 0.74%, which showed that the accuracy was very good. While our precision, which can be seen from the percent variation was not as good, which meant that the titrations were not set to similar enough colors shown by the