Description
Five color changes introduce pH indicators in a fun and entertaining way.

Application
Acids & Bases Solubility Precipitates

Theory
Phenolphthalein indicator solution is an acid-base indicator that remains colorless in an acid solution, but turns from colorless to pink in a base.

Materials
Barium nitrate solution, saturated
Beral-type pipets
Phenolphthalein soln.
Sodium bicarbonate

Safety
POISON: DO NOT DRINK THE "GRAPE JUICE" OR THE "MILK".
Students should wear protective gloves, chemical-resistant apron and safety glasses

Preparation

Disposal
Solution may be poured down the drain and flushed with water.