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12 Dec 2019

The accuracy of this experiment depends on good technique. Would the following technique error result in an erroneously high or an erroneously low calculated molarity of an NaOH solution? Briefly explain your reasoning.
C. After completing the titration, you noticed droplets of titrant clinging to the inner wall of your Erlenmeyer flask

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1. A student failed to carry out all of the procedural stepswhen doing this experiment. Would the following proceduralvariations result in an experimentally determined molarity of NaOHthat is too high or low? Briefly Explain.

a. The student did not clean the buret before beginning thetitration. After completing the titration, the student noticed thatdroplets of the titrant were clinging to the inside surface of thebarrel.

b. The buret tip was not completely filled with NaOH solutionwhen the titration was begun.

c. The student forgot to add phenolphthalein indicator solutionto the KHP solution before doing the titration.

4. Part A. The mass of KHC8H4O4 measured to the nearest milligram; however, the volume of water in which it is dissolved is never of concern-water is even added to the wall of the Erlenmeyer flask during the titration. Explain why water added to the KHC8H4O4 has no effect on the data, whereas water added to the NaOH solution may drastically affect the data.

5. Part B.2. The wall of the Erlenmeyer flask is occasionally rinsed with water from the wash bottle during the analysis of the aid solution. Will this technique result in the molar concentration of the acid solution being reported as too high, too low, or unaffected?

6. Parts A.6. and B.2. For the standardization of NaOH solution in Part A.6. the endpoint was consistently reproduced to a faint pink color. However, the endpoint for the titration of the acid solution in Part B.2 was consistently reproduced to a dark pink color. Will the reported molar concentration of the acid solution be too high, too low, or unaffected by the differences in the colors of the endpoints. Explain.

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