In this demo, the teacher creates a beautiful rainbow of colours in a demonstration tube using universal indicator and a dilute
acid and base.
Universal indicator can be used to illustrate an entire range of pH conditions because it is made up of a mixture of different
indicators that change colour at different pH values. As an acid is diluted with water, its pH increases—but never above pH 7.
Likewise, as a base is diluted, its pH decreases—but, again, never below pH 7. Continue reading
Special thanks to Kris L. for this submission!
Source: 19 December – Christmas Turkey Chemistry
Mercury thermometers are handy and useful, but they could be extremely dangerous to bring on planes. Continue reading
There’s a lot of pretty chemistry in the reaction of aluminum wire with copper(II) chloride! Burnished copper crystals grow on the wire surface, and the blue color of copper(II) ions slowly fades. What relationships govern the relative amounts of aluminum and copper in this reaction? Can you predict the amount of copper that will be produced and the amount of aluminum that will be used up?
Click here to download the complete experiment
Headlines keep on popping up in the news about exploding cellphones, laptops, and hover-boards. Continue reading
When mercury is added to aluminum, it forms an amalgam (a mercury alloy). Aluminum is normally protected by a thick oxide layer, but the formation of the amalgam disrupts it. Continue reading
Bradley teaches us about decomposition reactions and catalysts with a little help from a genie in a bottle. Continue reading
Most people don’t need matches, safety glasses and hydrogen gas to crack open an egg. But then again, Steve always finds the most unusual method to do the simplest things. Don’t try this at home. Continue reading