Chapter5: Errors In Chemical Analyses
Section: Chapter Questions
Problem 5.10QAP
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Question
In this double titration experiment determining composition of soda ash, you are given the following data:
- M HCl titrant: 0.0501 M +/- 0.0507
- Mass of soda ash sample, g: 0.2505 ± 2.0e-4 (Analytical Balance)
- Total volume of Sample Stock, mL: 75 ± 0.05 (100mL graduated cylinder)
- Volume of Sample Stock Aliquot, mL: 25 ± 0.3
Find the missing information. Show solutions
![Phenolphthalein Endpoint
Answer the concentrations in 3 significant figure.
The tolerance or error should follow the decimal place of the value.
You can use scientific notation using "e". Example: 0.0010 = 1.0e-3
Note that the confidence interval is totally separate from the tolerance/errors.
Trial
1
2
Net vol. of HCI
7.60 ± 0.14
7.90 + 0.14
7.90 + 0.14
(Vph), ML
Final titrant
volume in
calculations,
0.1000
0.1000
0.1000
mL
% composition
+I
+1
+1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F232853f5-580e-4211-bc82-ef1186aeae43%2F91812f16-a6b2-40c0-95f0-ed2666d993d6%2F0ve20w_processed.png&w=3840&q=75)
Transcribed Image Text:Phenolphthalein Endpoint
Answer the concentrations in 3 significant figure.
The tolerance or error should follow the decimal place of the value.
You can use scientific notation using "e". Example: 0.0010 = 1.0e-3
Note that the confidence interval is totally separate from the tolerance/errors.
Trial
1
2
Net vol. of HCI
7.60 ± 0.14
7.90 + 0.14
7.90 + 0.14
(Vph), ML
Final titrant
volume in
calculations,
0.1000
0.1000
0.1000
mL
% composition
+I
+1
+1
![Methyl Orange Endpoint
Answer the concentrations in 3 significant figure.
The tolerance or error should follow the decimal place of the value.
You can use scientific notation using "e". Example: 0.0010 = 1.0e-3
Note that the confidence interval is totally separate from the tolerance/errors.
Trial
1
2
3
Net vol. of HCL
12.00 ± 0.14 12.20 ± 0.14
12.00 ± 0.14
(Vmo), mL
Final titrant
volume in
calculations
0.100
0.100
0.100
% composition
+1
+I](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F232853f5-580e-4211-bc82-ef1186aeae43%2F91812f16-a6b2-40c0-95f0-ed2666d993d6%2F9wv6u7_processed.png&w=3840&q=75)
Transcribed Image Text:Methyl Orange Endpoint
Answer the concentrations in 3 significant figure.
The tolerance or error should follow the decimal place of the value.
You can use scientific notation using "e". Example: 0.0010 = 1.0e-3
Note that the confidence interval is totally separate from the tolerance/errors.
Trial
1
2
3
Net vol. of HCL
12.00 ± 0.14 12.20 ± 0.14
12.00 ± 0.14
(Vmo), mL
Final titrant
volume in
calculations
0.100
0.100
0.100
% composition
+1
+I
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