My ChemClub students came to my room for a holiday celebration today. We made a batch of sea foam candy, experimented with Elephant Toothpaste, and marbled gift tags.
When water is squeezed into an inverted flask containing ammonia, the ammonia dissolves in the water and the reduced pressure causes a fountain effect.
Multiple fountains are created as ammonia gas dissolves in water.
As the liquid flows out of the system, we see the ammonia fountain process in reverse.
The conductivities of a sulfuric acid solution and a barium hydroxide solution are tested, and will be the basis for monitoring a simple titration.
As a barium hydroxide solution is added to a sulfuric acid solution, the solution's conductivity gradually decreases. When the acid is consumed, the conductivity approaches zero, then rises again as more base is added.
Extraction of an acid with a base using a separatory funnel is demonstrated. In this initial step, the aqueous and organic solvents along with an indicator are added to the funnel.
Extraction of an acid with a base using a separatory funnel is demonstrated. In this step, aqueous base is added and the result noted.
Extraction of an acid with a base using a separatory funnel is demonstrated. In this step, aqueous acid is added and the result noted.
The reaction of a copper penny (minted pre-1982) and concentrated nitric acid (15 M) is shown. Red-brown nitrogen dioxide is generated and some of the copper dissolves to form a blue solution of copper(II) nitrate.
