Acids and bases > indicator

A solution of ammonia is poured into each of three beakers which contain (unknown to the audience) small amounts of phenolphthaleinlead nitrate and copper(II)

Dry ice is added to indicator solutions. Bubbles and a ‘fog’ are produced along with a gradual colour change. The experiment is a great way to demonstrate 

pH indicator is a substance which has one colour when added to an 

In this experiment students prepare a series of solutions by dilution. Each solution approximates to a 

A long glass tube is filled with a neutral solution of