chem 2c post labs - Post-Lab Data Summary Note some...

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Post-Lab Data Summary Note : some questions will display a variable like "nCount" or "SyInput" instead of an actual number in the data summary. Q# Question Text 6) 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: 0.535 No Points Possible 7) Scoring Scheme: 3-3-2-1 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: 0.00999 You Scored 3 points out of 3 Possible 8) 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 9) 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: 25.8 No Points Possible Your Answer: 25.6 No Points Possible Your Answer: 24.5 No Points Possible 10) Scoring Scheme: 3-3-2-1 Using the volumes of sodium thiosulfate solution you just entered and the molarity of the potassium iodate
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primary standard solution, calculate the molarity of the sodium thiosulfate secondary standard solution for each trial. Enter your calculated molarity of the sodium thiosulfate solution for each of the trials. Be sure to enter your calculated molarities in the corresponding order that you entered your sodium thiosulfate volumes previously. The sodium thiosulfate volume you entered for entry #1 above should correspond to the sodium thiosulfate molarity that you enter for entry #1 here. Your Answer: 0.0464 You Scored 2 points out of 3 Possible Your Answer: 0.0468 No Points Possible Your Answer: 0.0489 No Points Possible 11) Scoring Scheme: 3-3-2-1 The molarity of the sodium thiosulfate solution is taken as the average of the three trials.
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