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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 & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter1: Basic Concepts Of Chemistry
Section: Chapter Questions
Problem 21RPS: You and your lab partner are asked to determine the density of an aluminum bar. The mass is known...
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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%
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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