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The Red, White and Blue Density Column Demonstration Kit is attention-getting and sure to generate curiosity. Create a beautiful red, white and blue density column to demonstrate the salting-out effect, relative density and the more.

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Create a beautiful, red, white and blue density column to demonstrate the salting-out effect, relative density and the miscibility of organic solvents with water. The density column contains three liquid layers consisting of toluene, methyl alcohol and water. Methyl alcohol is “salted out” and separated from water by adding potassium carbonate. The water is dyed blue with copper(II) sulfate, and the toluene is colored red with Sudan III. Why don’t the methyl alcohol and toluene mix? Store the multicolored density column for up to a month in the glass bottle with chemical-resistant cap included with the kit. The attention-getting display is sure to generate lots of interest, giving you a great lead-in for lessons on density, polarity or solubility!

Concepts: Solubility, density, miscible and immiscible liquids, salting-out effect.
Time Required: 30 minutes
Note: Perform this demonstration in a fume hood or well-ventilated lab.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Analyzing and interpreting data
Constructing explanations and designing solutions

Disciplinary Core Ideas

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

Crosscutting Concepts

Patterns

Performance Expectations

MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
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-PS1-3. Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.