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Experiment C
Stoichiometry of a Reaction

Oxidation–reduction reaction
titration of iodine Oxidation–reduction reaction, titration of iodine, with New Titration Equipment
Oxidation–reduction reaction, titration of iodine (old setup used until 2009). Oxidation–reduction reaction, titration of iodine, with New Titration Equipment (introduced in December 2009).

This experiment illustrates how the determination of the stoichiometry of a reaction can be determined empirically using an oxidation–reduction titration. Iodine produced in the reaction is titrated with sodium thiosulphate and calculations can then be done to determine the ratio of iodate to iodine in the overall reaction.

Equipment List Chemical List
general pan balance
retort stand and buret clamp
50-mL beaker
50-mL volumetric flask
100-mL volumetric flask
50- or 125-mL Erlenmeyer flask
5-mL volumetric pipette
1-mL volumetric pipette
10-mL glass buret and stopcock
plastic funnel
spatula
stir rod
vial
meniscus reader *
paper towels *
potassium iodide (KI, ~8.3 g/student)
potassium iodate (KIO3, ~0.32 g/student)
starch inidcator in solution dropper
0.1000 N sodium thiosulphate standard
1.0 M hydrochloric acid
tap water *
soapy water *

* Not included in the kit; must be provided by the student at home.

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