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Percent Composition—Calcium Magnesium Acetate—Student Laboratory Kit

By: The Flinn Staff

Item #: AP7502 

Price: $34.02

The Percent Composition of Calcium Magnesium Acetate Chemistry Laboratory Kit provides a real-world application for a fundamental concept, percent composition! It also provides experience for calculating molar mass and percent composition.

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This item can only be shipped to schools, museums and science centers

Product Details

A real-world application for a fundamental concept—percent composition! Calcium magnesium acetate (CMA) is sold commercially as a “green” chemical deicer. It is less corrosive than salt for melting ice and protects delicate pet paws. Determine the percent composition of calcium versus magnesium acetate in CMA using a simple three-step process. Titrate with EDTA to determine total calcium and magnesium content, precipitate calcium ions with ammonium oxalate and then carry out a second EDTA titration on the filtrate to measure the amount of magnesium. Quantitative lab helps develop good lab skills and provides relevant experience for calculating number of moles, molar mass and percent composition. Includes reproducible student handouts, detailed background information, complete Teacher Notes with sample data and answers to all questions and all chemicals and consumable supplies needed to perform the lab.

Complete for 30 students working in pairs. Burets are required and available separately.


Materials Included in Kit: 
Ammonia/ammonium chloride buffer, pH 10, 200 mL
Ammonium oxalate solution, 0.25 N, 35 mL
Calcium magnesium acetate, 25 g
EDTA solution, 0.04 M, 400 mL
Eriochrome Black-T®, EBT, 0.15 g
Ethyl alcohol, 95%, 50 mL
Hydrochloric acid solution, 1 M, 500 mL

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
Using mathematics and computational thinking
Constructing explanations and designing solutions
Engaging in argument from evidence

Disciplinary Core Ideas

HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Scale, proportion, and quantity
Systems and system models
Structure and function
Stability and change

Performance Expectations

HS-PS1-1. Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
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-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.