Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry
Section: Chapter Questions
Problem 9.16QAP
Related questions
Question
I need help calculating the concentration of acid in each buffer solution show in the second picture!!!!
EXPERIMENTAL DATA
| Sample | HIn (mL) | 1.10 M Acetic Acid (mL) | 0.90 M Sodium Acetate (mL) |
|---|---|---|---|
| 1 | 10.00 | 8.00 | 2.00 |
| 2 | 10.00 | 7.00 | 3.00 |
| 3 | 10.00 | 6.00 | 4.00 |
| 4 | 10.00 | 5.00 | 5.00 |
| 5 | 10.00 | 4.00 | 6.00 |
| 6 | 10.00 | 3.00 | 7.00 |
| 7 | 10.00 | 2.00 | 8.00 |
| 8 | 10.00 | 1.00 | 9.00 |
| 9 | 10.00 | 10.00 mL NaOH (0.10 M) | |
| 10 | 10.00 | 10.00 mL HCl (0.10 M) |
Absorbance
Unrounded
Rounded
1
3
3
3
4
5
3
7
3
8
3
10](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ec4ad6c-acbd-4f02-b698-93b59bc8505a%2F4e8f696d-17ec-4a47-aec9-b6fdd99216a9%2F3z6yssd_processed.png&w=3840&q=75)
Transcribed Image Text:Calculate the concentration of acid in each buffer solution. The pKa of acetic acid is 4.745.
Sample
[H3O*](M)
Absorbance
Unrounded
Rounded
1
3
3
3
4
5
3
7
3
8
3
10
![CALCULATED VALUES
EXPERIMENTAL DATA
SAMPLE
[H,0*1(M)
ABSORBANCE
1
8.8e-5
0.058693
5.13 e-5
0.100357
3.3e-5
0.138553
2,2 e-5
0.192163
4
1.47e-5
0.220571
9.42 e-6
6.29434い
6.
7
ら.5e-6
0.336445
2.44e-6
0.572272
8.
NAH
2.0 e- 13
O.4001944
10
5.0e-9
- 0. 002597
Hcl
Calculated Values/Values from the Graph
Calculated absorbance A, for [HIn] = [In]
0.1987985c
%3D
K
K of bromocresol green (experimental value) 2.2857 e-05
pK of bromocresol green
Total indicator concentration, test tube
Total indicator concentration, stock solution
2.
5](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ec4ad6c-acbd-4f02-b698-93b59bc8505a%2F4e8f696d-17ec-4a47-aec9-b6fdd99216a9%2Fywuvt4a_processed.png&w=3840&q=75)
Transcribed Image Text:CALCULATED VALUES
EXPERIMENTAL DATA
SAMPLE
[H,0*1(M)
ABSORBANCE
1
8.8e-5
0.058693
5.13 e-5
0.100357
3.3e-5
0.138553
2,2 e-5
0.192163
4
1.47e-5
0.220571
9.42 e-6
6.29434い
6.
7
ら.5e-6
0.336445
2.44e-6
0.572272
8.
NAH
2.0 e- 13
O.4001944
10
5.0e-9
- 0. 002597
Hcl
Calculated Values/Values from the Graph
Calculated absorbance A, for [HIn] = [In]
0.1987985c
%3D
K
K of bromocresol green (experimental value) 2.2857 e-05
pK of bromocresol green
Total indicator concentration, test tube
Total indicator concentration, stock solution
2.
5
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