Circle the questions that have been assigned. Part A.1. The KIO_3 sample was not

Question

Circle the questions that have been assigned. Part A.1. The KIO_3 sample was not sufficiently dried. Will the reported molar concentration of the KIO_3 solution (Part B.3) be too high, too low, or unaffected? Explain. Part A. 1. The mass of KIO_3 used to prepare the solution was measured to be 0.585 g instead of the calculated 0.535 g. a. Will the molar concentration of the KIO_3 solution be greater or less than 0.01 M KIO_3? Explain. b. As a result of this (now) prepared KIO_3 solution, will more or less volume of KIO_3 solution be used for the vitamin C analysis? Explain. Part B.1. The NaHCO_3 solution is omitted in an analysis of the sample. Will the reported amount of ascorbic acid in the sample be too high, too low, or unaffected? Explain. Part C.1. Explain why the mass of K1 (-1 g), and the volume of starch (-2 mL) are only approximate even though the analysis is quantitative. Part C.2. After adding the standard solution of KIO_3 to the prepared analyte, the sample solution never forms the deep- blue color. What modification of the Experimental Procedure or error corrected can be made in order to complete the analysis? Part C.2. The deep-blue color of the I^-_3 starch complex does not appear but a yellow-brown does appear! What next? Should you continue titrating with the standard KIO_3 solution or discard the sample? Explain. Part C.2. The final buret reading is read and recorded as 27.43 mL instead of the correct 28.43 mL. Will the reported amount of ascorbic acid in the sample be too high or too low? Explain.

Explanation / Answer

1. If KIO3 sample is not sufficiently dried that means it has some amount of water in it. When some measured amount of the KIO3 is dissolved in water to make the solution, the weighed amount also contains some amount of water ( as the solute was not sufficiently hydrated) . So the solution prepared will have less amount of solute, and hence the molarity will be too low.

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

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