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A Colorful Decomposition of a Carbonate—Chemical Demonstration Kit

By: Borislaw Bilash II, Pascack Valley High School, Hillsdale, NJ

Item #: AP6602

Price: $21.10

A Colorful Decomposition of a Carbonate Oxidation–Reduction Chemical Demonstration Kit requires students to deduce a chemical reaction leading to color change. Via guided inquiry, students find which reaction occurs and what products form.

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Challenge students to deduce the chemical reaction that leads to dramatic color changes when a sample of copper carbonate is heated. Copper carbonate is added to a flask, and a wine airlock containing bromthymol blue solution is placed on top of the flask. The flask is then heated on a hot plate, decomposing the green copper carbonate to black copper oxide and carbon dioxide gas. The gas bubbles through the bromthymol blue indicator solution, lowering the pH and causing a color change from blue to yellow. Through a series of guided questions, students determine what reaction is occurring and what products form. Teacher Demonstration Notes, reproducible student worksheet and answer sheet are included.

Concepts: Decomposition, gas solubility, indicators.
Time Required: 15 minutes
Materials Provided: Copper(II) carbonate, bromthymol blue indicator solution, wine airlock, 1-hole rubber stopper.
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