post lab discussion: exp. 6

Question 1

involves species which undergo reduction-oxidation (redox) reaction

Answer 1

redox titration

Question 2

what are the 2 common titration methods based on redox titration

Answer 2

iodimetry
iodometry

Question 3

what is the diff btwn iodimetry and iodometry

Answer 3

iodimetry - used to quantify a reducing agent
iodometry - used to quantify an oxidizing agent

Question 4

what is the endpoint in redox titration

Answer 4

blue-black

Question 5

a technique that involves titrating free iodine with a reducing agent. As a result, iodine decreases to iodide and oxidizes other species.

Answer 5

iodimetry

Question 6

is an indirect titration method in which the amount of iodine used is measured, which was used prior to the redox titration, through the means of a separate titration.

Answer 6

iodometry

Question 7

iodimetry in redox titration,
titrant:
indicator:
endpoint:

Answer 7

titrant: standard thiosulfate soln.
indicator: starch
endpoint: disappearance of dark-blue color from intense blue-black to colorless

Question 8

iodometry in redox
titrant:
analyte:
indicator:
endpoint:

Answer 8

titrant: KIO3 soln. (potassium iodate)
analyte: ascorbic acid
indicator: starch
endpoint: blue-black