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Product 12857

By: The Flinn Staff

With the Dyeing Sodium Polyacrylate with Metal Ions Chemistry Laboratory Kit, students observe the ion-exchange properties of sodium polyacrylate by testing the ability of the polymers to decolorize solutions of ions.

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Product Details

Sodium polyacrylate, the superabsorbent polymer found in disposable diapers, absorbs immense amounts of water. Did you know that it will also remove heavy metal cations from solution? The cross-linked polymer contains a large number of sodium ions. When it is placed in a solution containing other metal ions, they preferentially bind to the anionic sites in the polymer, displacing the sodium ions and resulting in the formation of new, colored metal polymers. Students will first observe the ion-exchange properties of sodium polyacrylate by testing the ability of the polymers to decolorize solutions of copper and iron ions. Then, students will determine the exchange capacity of the polymer by measuring the amount of copper removed from a standard solution of copper(II) ions using colorimetric analysis. Complete for 30 students working in pairs. Requires a spectrophotometer or colorimeter.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
HS-PS1.A: Structure and Properties of Matter
HS-PS2.B: Types of Interactions

Crosscutting Concepts

Scale, proportion, and quantity
Structure and function
Stability and change

Performance Expectations

HS-PS2-6. Communicate scientific and technical information about why the molecular-level structure is important in the functioning of designed materials.