These questions are coming from Determination of Ion by Dichromate Oxidation lab

Question

These questions are coming from Determination of Ion by Dichromate Oxidation lab.

1. Roberta Spud (not her real name) had just gotten her third unknown dissolved and ready to be titrated when she realized that she had left the lights on in her car (illegally parked at the loading dock of the Cook Building). She quickly ran down to shut them off but found that UVM Security had towed the car. After calling Security to arrange for the release of her vehicle, she headed back to the lab to finish up her red-ox Fe determination. When Roberta began writing up her report, she noticed that the %-Fe value obtained from her third titration was a bit on the high side relative to the others, but not high enough to be thrown out by the Q-test. A look at her lab notebook revealed that her dissolved unknown for this trial had sat around for 15-20 minutes while she was occupied with her car troubles. Furthermore, the experimental write-up mentioned that the Fe2+ could be airoxidized if it sat in solution for too long. "A determinate error!” she cried and promptly tossed out the discordant datum. Was Roberta justified in throwing out the errant %-Fe value? Explain.

2. In an acid/base titration using potentiometric endpoint detection, the pH meter must be calibrated with standard buffers prior to beginning. When performing this potentiometric titration, it was not necessary for you to have to calibrate your meter before beginning your titration. Why not?

Explanation / Answer

given that the minimum value was in error and the test conrespecto Q was not significant so differently, it could have its most approximate value weighted with a statistical test called ... split plot where a data value is determined with respect to the other by columns and rows of data.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.