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Sep 07, 2024
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2023-2024 Digital Badge Bulletin [ARCHIVED CATALOG]
Analytical Chemistry Lab Skills Digital Badge
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Contact Information
The Analytical Chemistry Lab Skills badge is a competency badge offered by the Department of Chemistry and Biochemistry. This culminating badge showcases content and skills in pipette calibration, verifying a calibration model, standardizing a base by titration, and spectroscopically determining dye concentration. Competencies are demonstrated through academic coursework in an analytical chemistry laboratory setting.
Earning Criteria
Participants earning this badge have demonstrated a breadth of analytical chemistry lab skills through their completion of the following set of four badges in an analytical chemistry laboratory setting: Pipette Calibration, Verifying a Calibration Model, Standardizing a Base by Titration, and Spectroscopically Determining Dye Concentration.
Competencies Demonstrated
- Choose the appropriate tip for the micropipette.
- Demonstrate proper technique using a micropipette.
- Calculate the sample standard deviation of the ten trials for each volume tested.
- Solve for the coefficient of variation (CV%) and inaccuracy (A%).
- Evaluate if the coefficient of variation is within the manufacturer’s specifications.
- Evaluate if the accuracy is within the manufacturer’s specifications.
- Operate an analytical balance to weigh a standard accurately.
- Calculate the amount of stock solution needed to prepare calibration standards.
- Use volumetric glassware to achieve the required final volume of solution.
- Create a linear calibration model in a spreadsheet program
- Evaluate the coefficient of determination (R2 value) and ensure it has a value of 0.99 or greater
- Construct a residual plot from values derived using the calibration model.
- Judge if the error in the signal of the calibrators is randomly distributed.
- Analyze an external control and use the calibration model to determine its concentration.
- Calculate the percent error and ensure it is less than 10%.
- Use an analytical balance to accurately weigh a primary standard.
- Perform a titration for at least three trials, or until a precision of 1% relative standard deviation is achieved.
- Calculate the concentration of base.
- Solve for the sample standard deviation, average, and percent relative standard deviation.
- Report final values to the correct number of significant figures.
- Calculate the percent error for the average concentration. This percent error must be less than or equal to 10%. If this benchmark is not met, the student will have another opportunity to collect more data if they choose.
- Compare the standard deviation to the uncertainty of the concentration.
- Evaluate in a written statement if the results are both accurate and precise.
- Use volumetric glassware and a micropipette to make calibration standards of two dyes.
- Operate a spectrometer to measure the absorbance of each standard.
- Calculate the molar absorptivity for each dye at the chosen wavelengths.
- Measure the absorbance of the control at the five chosen wavelengths.
- Employ Excel’s Solver tool to approximate the concentration of each dye.
- Estimate the concentration of a control. An accuracy of at least 10% is required.
- Measure the absorbance of the commercial beverage at the five chosen wavelengths.
- Create a mock beverage and spectroscopically compare the mock beverage to the commercial beverage.
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