Ammonia gas is easily generated by heating concentrated ammonium hydroxide solution. With the Solubility of Ammonia: Indicator Color Show—ChemTopic™ Lab Activity, ammonia gas is collected in jumbo pipet bulbs and its solubility and acid–base properties are investigated, resulting in a beautiful indicator color show. Available as part of the Chemistry of Gases—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.