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Product 12768

By: The Flinn Staff

In the Determination of Iron in Dietary Supplements Consumer Chemistry Laboratory Kit, students analyze iron supplements using acid digestion, serial dilution and colorimetric analysis. Do the supplements contain the amount they claim?

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Iron is an essential mineral for human health. When dietary supplements of iron are recommended, many people turn to over-the-counter pills. What is the form of iron in these pills, and do they actually contain the amount of iron they claim? Have students analyze them and find out! The amount of iron in dietary supplements is determined using acid digestion, serial dilution and colorimetric analysis. The color intensity is compared using a color chart to determine the amount of iron in the final solution. To confirm the iron concentration, students do a side-by-side comparison with a “spiked” sample to which they have added a known amount of iron. It’s a challenging lab, but the results are very accurate, and students appreciate the real-world applications! Will their results match the information provided on the supplement label?

Complete for 30 students working in pairs.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data

Disciplinary Core Ideas

HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Systems and system models
Scale, proportion, and quantity

Performance Expectations

HS-PS1-2: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.