lab 8 - Post-Lab Data Summary Note : some questions will...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 3) Data Entry - No Scoring Part I. What was the precise mass in grams of the KIO 3 that you dissolved in 250 mL of de-ionized water to make your 0.01 M primary standard solution? You should be reporting the mass to one thousandth of a gram, e.g. 0.535 g. m (g) = Your Answer: 0.538 No Points Possible 4) Scoring Scheme: 3-3-2-1 Part I. What was the resulting molarity of your primary standard solution of potassium iodate KIO 3 ? M (mol/L) = Your Answer: 0.01 You Scored 3 points out of 3 Possible 5) Scoring Scheme: 3-3-2-1 Part II. What volume in mL of 1 M Na 2 S 2 O 3 stock solution is correct to prepare 500 mL of 0.05 M Na 2 S 2 O 3 ? V (mL) = Your Answer: 25 You Scored 3 points out of 3 Possible 6) Scoring Scheme: 3-3-2-1 Part III.The two reactions involved in quantitatively determining the amount of iodate in solution are: IO 3 - (aq) + 5 I - (aq) + 6 H + (aq) --> 3 I 2 (aq) + 3 H 2 O(l) followed by reaction of the I 2 : I 2 (aq) + 2 S 2 O 3 2- --> 2 I - (aq) + S 4 O 6 2- (aq). What is the stoichiometric factor, that is the number of moles of Na 2 S 2 O 3 reacting with one mole of KIO 3 ? Factor = Your Answer: 6 You Scored 3 points out of 3 Possible 7) Data Entry - No Scoring Part III. When you standardized the Na 2 S 2 O 3 , what was the volume of KIO 3 that you measured out as a sample for each of your three trials? You should enter your volumes to the nearest 0.02 mL. Your Answer: 10 No Points Possible Your Answer: 10 No Points Possible Your Answer: 10 No Points Possible
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8) Data Entry - No Scoring Part III. When you standardized the Na 2 S 2 O 3 , what volume of Na 2 S 2 O 3 in mL was required for each of your three trials? You should enter your volumes to the nearest 0.02 mL, e.g. 12.08 mL and in the corresponding sequence with the volume of KIO 3 used for the samples. Your Answer: 8.85 No Points Possible Your Answer: 10.25 No Points Possible Your Answer: 12.3 No Points Possible 9) Scoring Scheme: 3-3-2-1 Part III. When you standardized the Na 2 S 2 O 3 , what molarity of Na 2 S 2 O 3 did you obtain for each of your three trials? You should enter your molarity to 3 significant figures e.g. 0.0488 and in the corresponding sequence with the volumes already entered. Your Answer: 0.0678 You Scored 3 points out of 3 Possible Your Answer: 0.0586 No Points Possible Your Answer: 0.0488 No Points Possible 10) Scoring Scheme: 3-3-2-1 Part III. Please enter the average of the values for the molarity from the trials to 3 significant figures. Avg (mol/L) = Your Answer: 0.0584 You Scored 3 points out of 3 Possible 11) Scoring Scheme: 3-3-2-1 Part III. Please enter the value you calculated for the standard deviation of the trials for the determination of the molarity. You should report 2 significant figures e.g. 0.0054
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

lab 8 - Post-Lab Data Summary Note : some questions will...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online