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time at the balance, and potassium iodate takes a few minutes to dissolve so you
only have to wait once instead of several times.
2 • Since you know very precise information about your iodate solution, make
iodate your limiting reagent. If you do your reactions with about 20 mL of iodate
solution you will need about two grams of potassium iodide and a few milliliters
of the 3 M sulfuric acid. Use your 10.00 mL transfer pipet (twice) to measure
20.00 mL the potassium iodate. This mixture will turn brown.
In an acidic solution, iodate and iodide react to produce iodine. Sulfuric acid is
chosen for this reaction since the sulfate anion will not interfere with this
particular set of redox reactions.
Save time by carefully measuring only your limiting reagent. The excess reagents
can be measured out much more generally. On the other hand, do not waste
chemicals by adding large excesses of the other reagents.
• Add enough deionized water to the titration flask so that you can easily see
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07