Spectrophotometry

Assessing and quantifying experimental accuracy and precision: UV-Vis spectrophotometry

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Identify the instrumental components and operational steps required to record a UV-Vis spectrum. Rearrange single-step dilution equations to calculate solution concentrations and required stock volumes. Construct linear calibration curves for potassium permanganate, evaluate calibration linearity using R^2 values, and assess data quality by calculating the accuracy and precision (%RSD) of quality control (QC) samples.

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Learning outcomes

identify the steps involved in recording a UV-Vis spectrum.
construct a calibration curve to calculate the concentrations of unknown solutions.
rearrange equations to perform calculations involving volumes and concentrations.
distinguish between data linearity, accuracy and precision.
assess the quality of experimental data in terms of calibration linearity and QC accuracy and precision.

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Skills

Using Instruments and Equipment

Describe the function of optical components within single- and double-beam UV-Vis spectrophotometers
Perform blank calibrations and practice proper cuvette handling to record accurate absorbance measurements

Manipulating and Presenting Data

Rearrange the single-step dilution equation C_1V_1 = C_2V_2 to calculate required stock volumes and final concentrations
Plot absorbance versus concentration calibration curves and compute standard deviations and %RSD values from raw dataset trials

Interpreting and Analysing Data

Evaluate calibration curve linearity and R^2 values to detect data outliers
Compare experimental QC concentrations against true values and evaluate relative standard deviation (%RSD) to assess accuracy and precision

Concepts, Principles and Theories

Explain the operational principles of UV-Vis spectrophotometry and distinguish between data linearity, accuracy, and precision
Apply the linear relationship between light absorbance and solute concentration to evaluate theoretical experimental quality

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Dr Yin Sim Tor

Taylor’s University

“Smart Worksheets gave us meaningful insight into how students think through bioscience problems, moving beyond simply tracking them completing a task.”

Details

Degrees

Foundation science

Chemistry

Discipline

Solutions and dilutions

Topic

Spectrophotometry

Purchase option

The Smart Worksheet Library

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