Calculate accuracy and precision for each set of 5 aliquots. Assume that the density of water Is g/mL. Accuracy is how close a set of values measures to a standard value. Precision is a measur not of values is to one another and is measured by the deviation.
Calculate accuracy and precision for each set of 5 aliquots. Assume that the density of water Is g/mL. Accuracy is how close a set of values measures to a standard value. Precision is a measur not of values is to one another and is measured by the deviation.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
100%
How do I solve for the percent value? The sample data calculated the answers but I have no idea how they obtained the percent error values. Calculate sample data #1 with detailed steps.
![Remember, each partner should complete the entire exercise.
Questions to ponder before starting the exercise. What do you expect to learn from this exercise? Should
you see any changes in error and/or deviation? Why or why not? Think about other questions to consider.
When you design an experiment, it is important to consider the possible outcomes before you start.
Calculate accuracy and precision for each set of 5 aliquots. Assume that the density of water is 1
g/mL. Accuracy is how close a set of values measures to a standard value. Precision is a measure
of how close a set of values is to one another and is measured by the deviation.
% error = (accepted value - experimental value) / accepted value * 100%
Formula for accuracy:
Formula for precision:
Determine the average value of your 5 (or fewer) measurements.
Then calculate the deviation for each measurement
Deviation = (average - actual)
Sample calculation: for a sample of 5 weights pipetting 10 µL of distilled water.
Average of 5 measurements
((10.3125+9.9135+11.1455+10.0012+9.8021)/5) = 10.2350
Sample
Volume based on 1 g/mL
Error (%)
Deviation (mL)
Model
2-20 μL
2-20 μL
2-20 μL
10-100 μL
10-100 με
10-100 μL
20-200 μL
20-200 με
20-200 μL
1
2
10.3125 9.9135
- 3.125 0.865
-0.0775 0.3215
100-1000 μL
100-1000 μL
100-1000 μL
Adjustable Volume Eppendorf Research Pipette Accuracy and Precision Data as provided by
Eppendorf
Volume
2 µL
10 μL
20 µL
3
11.1455
-11.4550
-0.9105
10 μL
50 µL
100 μL
20 μL
100 μL
200 µL
100 μL
500 µL
1000 μL
4
10.0012
-0.012
0.2338
Inaccuracy
+/-5.0%
+/-1.2%
+/-1.0%
+/-3.0%
+/-1.0%
+/-0.8%
+/-2.5%
+/-1.0%
+/-0.6%
+/-3.0%
+/-1.0%
+/-0.6%
5
9.8021
1.989
0.4329
Imprecision
<=1.5%
<=0.6%
<=0.3%
<=1.0%
<=0.3%
<=0.2%
<=0.7%
<=0.3%
<=0.2%
<=0.6%
<=0.2%
<=0.2%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9372b6fe-9d83-4cc3-b9b6-3000d02c5781%2Fa5077e43-70ea-4787-b5b7-10ef5086b412%2Fzbcx9ua_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Remember, each partner should complete the entire exercise.
Questions to ponder before starting the exercise. What do you expect to learn from this exercise? Should
you see any changes in error and/or deviation? Why or why not? Think about other questions to consider.
When you design an experiment, it is important to consider the possible outcomes before you start.
Calculate accuracy and precision for each set of 5 aliquots. Assume that the density of water is 1
g/mL. Accuracy is how close a set of values measures to a standard value. Precision is a measure
of how close a set of values is to one another and is measured by the deviation.
% error = (accepted value - experimental value) / accepted value * 100%
Formula for accuracy:
Formula for precision:
Determine the average value of your 5 (or fewer) measurements.
Then calculate the deviation for each measurement
Deviation = (average - actual)
Sample calculation: for a sample of 5 weights pipetting 10 µL of distilled water.
Average of 5 measurements
((10.3125+9.9135+11.1455+10.0012+9.8021)/5) = 10.2350
Sample
Volume based on 1 g/mL
Error (%)
Deviation (mL)
Model
2-20 μL
2-20 μL
2-20 μL
10-100 μL
10-100 με
10-100 μL
20-200 μL
20-200 με
20-200 μL
1
2
10.3125 9.9135
- 3.125 0.865
-0.0775 0.3215
100-1000 μL
100-1000 μL
100-1000 μL
Adjustable Volume Eppendorf Research Pipette Accuracy and Precision Data as provided by
Eppendorf
Volume
2 µL
10 μL
20 µL
3
11.1455
-11.4550
-0.9105
10 μL
50 µL
100 μL
20 μL
100 μL
200 µL
100 μL
500 µL
1000 μL
4
10.0012
-0.012
0.2338
Inaccuracy
+/-5.0%
+/-1.2%
+/-1.0%
+/-3.0%
+/-1.0%
+/-0.8%
+/-2.5%
+/-1.0%
+/-0.6%
+/-3.0%
+/-1.0%
+/-0.6%
5
9.8021
1.989
0.4329
Imprecision
<=1.5%
<=0.6%
<=0.3%
<=1.0%
<=0.3%
<=0.2%
<=0.7%
<=0.3%
<=0.2%
<=0.6%
<=0.2%
<=0.2%
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