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Salting Out—Density Bottle Kit

By: Lynn Higgins, ACS Polymer, Ambassador, MO

Item #: AP7931 

Price: $31.49

In Stock.

The Salting Out and Density Chemical Demonstration Kit is an attention-getting display that gives a great lead-in for lessons on density, polarity and solubility. Students watch as beads move in a bottle and observe miscibility properties.

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

Product Details

Two layers of beads are suspended in the middle of a bottle. Give the bottle a shake and the beads move to opposite ends. The beads then slowly move back to the starting position. How does this happen? Two liquid layers of differing densities create an interface in the middle of the bottle. When the bottle is shaken, a homogenous liquid mixture of uniform density is formed and the apparent densities of the beads can be observed. The attention-getting display is sure to generate questions and gives you a great lead-in for lessons on density, polarity and solubility. Teacher Demonstration Notes and student handouts are included. The bottle may be reused for years.

Concepts: Density, non-polar vs. polar, solutions, immiscibility
Time Required: 10 minutes 

Special thanks and acknowledgment to Lynn Higgins, ACS Polymer, Ambassador, MO, in recognition of her creative activity idea that this demonstration is based on.


Materials Included in Kit: 
Isopropyl alcohol, reagent, 500 mL
Sodium chloride, 100 g
Plastic soda bottle, 1 L
Pony bead, green, 9 mm, 50 g
Ultraviolet detection beads, 50 g

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Developing and using models
Obtaining, evaluation, and communicating information
Analyzing and interpreting data

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

Structure and function
Cause and effect
Systems and system models

Performance Expectations

MS-PS1-1. Develop models to describe the atomic composition of simple molecules and extended structures.
MS-PS1-3. Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.
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-PS2-6. Communicate scientific and technical information about why the molecular-level structure is important in the functioning of designed materials.