Your Safer Source for Science

Since 1977


P.O. Box 219 Batavia, IL 60510

Phone 800-452-1261
Fax 866-452-1436

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.

See more product details

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

Product Details

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.