Safe Swimming with Sodium - Chemical Demonstration Kit
By: The Flinn Staff
Item #: AP8916
The Safe Swimming with Sodium Chemical Demonstration Kit is a novel variation of alkali metals reacting with water, which is much safer to perform than the standard sodium demo of dropping a piece of alkali metal into a beaker of water.
No chemistry class is complete without the spectacular demonstration of alkali metals reacting with water. Safe Swimming with Sodium is a novel variation which is much safer to perform than the standard sodium demonstration of simply dropping a small piece of alkali metal into a beaker of water. In this demonstration, two immiscible liquids, water and mineral oil, are poured into a graduated cylinder. When a small piece of sodium is added to the cylinder it falls through the top layer of mineral oil and reacts with the water at the interface and is forced back into the mineral oil layer. The density of sodium brings it back down into contact with the water and the process begins again. Sodium pieces are pre-cut for use. Teacher Demonstration Notes included. Enough materials are included to perform the demonstration seven times.
Concepts: Alkali metals, density, immiscible liquids.
Time Required: 15 minutes
Chemicals Provided: Sodium, phenolphthalein, mineral oil.