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Water Softening—Guided-Inquiry Kit

By: The Flinn Staff

Item #: AP7352

Price: $45.15

In Stock.

The Water Softening Guided-Inquiry Consumer Chemistry Kit lets students identify the minerals removed through ion exchange and understand the practical benefits of water softening. Students learn of water hardness, complex ions and more.

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Product Details

It’s not that hard! Use this water-softening inquiry lab to teach the concepts of water hardness, complex ions, ion exchange and titration. Water samples with unknown hardness will be treated with ion-exchange resin and analyzed by EDTA titration. Students use flowcharts to outline their self-designed experiments for determining the optimum amount of ion-exchange resin to soften their particular water sample. Thoughtful guided-inquiry experiment lets students identify the minerals removed through ion exchange and understand the practical benefits of water softening. Includes reproducible student handouts, detailed Teacher Notes and all necessary chemicals and consumable supplies. Complete for 30 students working in pairs.

Specifications

Materials Included in Kit: 
Ammonia/Ammonium chloride buffer, pH 10, 500 mL
Calcium chloride, 15 g
EDTA solution, 0.04 M, 400 mL
Eriochrome black T, EBT, 0.15 g
Ion exchange resin, SAC-Na, 400 g
Magnesium chloride, 15 g
Microspatulas, pkg/8, 2
Potassium chloride, 15 g
Sodium chloride, lab grade, 50 g


Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Planning and carrying out investigations
Analyzing and interpreting data
Constructing explanations and designing solutions

Disciplinary Core Ideas

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

Crosscutting Concepts

Scale, proportion, and quantity
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.