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Question Text
5)
Data Entry  No Scoring
Enter the precise mass in
GRAMS
of the potassium iodate used to prepare your primary standard solution.
Your mass precision should be reported to a thousandth of a gram, i.e. 0.302. (Use 3 significant figures.)
Your Answer:
0.5340
No Points Possible
6)
Scoring Scheme: 3321
If one had weighed out precisely 0.500 g of KIO
3
for the primary standard solution and dissolved it in
enough deionized water to make a 250 mL solution, the molarity of that solution would be 0.00935 M.
Enter your calculated molarity of the primary standard KIO
3
solution. Please use 3 significant figures.
Your Answer:
0.009980
You Scored
3
points out of
3
Possible
7)
Data Entry  No Scoring
Standardization of the sodium thiosulfate solution using the potassium iodate primary standard solution.
We must examine each of the three acceptable trials.
First, let's consider the analyte volume. You were instructed to pipet two 10.00 mL aliquots of potassium
iodate into an Erlenmeyer flask for each analyte sample to be titrated. Therefore, your analyte volumes of
the potassium iodate should be 20.00 mL.
For each trial, enter the precise volume in mL of potassium iodate solution used in the standardization of
sodium thiosulfate (e.g. 20.00 mL or 10.00 mL):
Your Answer:
20
No Points Possible
Your Answer:
20
No Points Possible
Your Answer:
20
No Points Possible
8)
Data Entry  No Scoring
Standardization of the sodium thiosulfate solution using the potassium iodate primary standard solution.
Now we will examine the volumes of titrant, sodium thiosulfate, used in each trial.
Your titration volumes of the sodium thiosulfate solution should be approximately 20  30 mL.
For each trial, enter the precise volume in mL of sodium thiosulfate solution used in the titration of your
potassium iodate solution (e.g. 20.34 mL):
Your Answer:
26
No Points Possible
Your Answer:
23.70
No Points Possible
Your Answer:
26.10
No Points Possible
9)
Scoring Scheme: 3321
Using the volumes of sodium thiosulfate solution you just entered and the molarity of the potassium iodate
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This note was uploaded on 03/08/2011 for the course CHE 2C taught by Professor Enderle during the Summer '08 term at UC Davis.
 Summer '08
 Enderle
 Chemistry, Redox

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