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Harris - Quantitative Chemical Analysis 8/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 37 / 38

Due : Wednesday, September 25, 2019 07:45 EDT

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5
–/5 –/7 –/6 –/4 –/16
Total
37/38 (97.4%)

  • Instructions

    Quantitative Chemical Analysis 8/e by Daniel C. Harris published by W. H. Freeman is now available as a WebAssign Premium product--designed to provide you with the most powerful online homework solution to complement your course and your students with a fully interactive and affordable learning experience!

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Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. –/5 points HarrisChem8 3.P.02. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
–/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50
Total
–/5
 
Round each number as indicated.
(a) 1.2215 to 4 significant figures
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

1.222

(b) 1.2835 to 3 significant figures
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

1.28

(c) 2.289 to 3 significant figures
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

2.29

(d) 2.031 to 3 significant figures
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

2.03

(e) 20.068 to 3 significant figures
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

20.1
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2. –/7 points HarrisChem8 3.P.05. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7
–/1 –/1 –/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50 0/50 0/50
Total
–/7
 
Write each answer with the correct number of digits.
(a) 1.133 + 2.41 = 3.543
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

3.54

(b) 17.5 - 1.01 = 16.49
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

16.5

(c) 4.27 ✕ 6.7 = 28.609
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

29

(d) 0.0602 ÷ (2.113 ✕ 104) = 2.84903 ✕ 10-6
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2.85e-06

(e) log(4.185 ✕ 1012) = ?
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12.6217

(f) antilog( -3.97) = ?
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0.00011

(g) 102.093 = ?
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124
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3. –/6 points HarrisChem8 3.P.12. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
–/1 –/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50 0/50
Total
–/6
 
Identify whether the errors in parts (a)-(d) are random or systematic.
(a) A 25 mL transfer pipet consistently delivers 25.043 ± 0.008 mL. What kind of error is in 25.043?
    
What kind of error is in 0.008?
    

(b) A 10 mL buret consistently delivers 1.98 ± 0.01 mL when drained from exactly 0 to exactly 2 mL and consistently delivers 2.03 ± 0.02 mL when drained from 2 to 4 mL. What kind of error is in 1.98?
    
What kind of error is in 0.01?
    

(c) A 10 mL buret delivered 1.9901 g of water when drained from 0.00 to 2.00 mL. The next time I delivered water from the 0.00 to the 2.00 mL mark, the delivered mass was 1.9900 g. What kind of error is causing the difference between 1.9901 and 1.9900 g?
    

(d) Four consecutive 20.0 µL injections of a solution into a chromatograph were made and the area of a particular peak was 4383, 4410, 4401, and 4390 units.
    
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4. –/4 points HarrisChem8 3.P.14. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50
Total
–/4
 
Rewrite the number 3.20000 (± 0.16789%) in the following forms, with an appropriate number of digits.
(a) number (± absolute uncertainty)
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

3.200

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.005

(b) number (± percent relative uncertainty)
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

3.200

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.2

 %
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5. –/16 points HarrisChem8 3.P.15. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
Total
–/16
 
Find the absolute and percent relative uncertainty.
(a) 6.2 (±0.1) - 4.0 (±0.2) = ?
absolute uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

2.2

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.2
percent uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

2.2

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

10

 %

(b) 8.54 (±0.06) ✕ 0.023 (±0.002) = ?
absolute uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.20

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.02
percent uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.20

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

9

 %

(c) [6.5 (±0.3) - 3.6 (±0.2)] ÷ 9.19 (±0.04) = ?
absolute uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.32

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.04
percent uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.32

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

10

 %

(d) 9.14 (±0.04) ✕ {[6.1 (±0.1) ✕ 10-3] + [4.0 (±0.2) ✕ 10-3]} = ?
absolute uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.092

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.002
percent uncertaintyWebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

0.092

 ± WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

2

 %
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