![]() Copper(II) sulfate solution, 0.5 M, 1 cm 3.Dilute nitric acid, 2 M (CORROSIVE), 250 cm 3.The demonstration lasts about three minutes, or longer if explaining the chemistry to a post-16 audience. It takes about 30–45 minutes to set up. Pouring the contents of the beakers into acid reverses the changes, to give a colourless solution. The beakers’ contents turn red, milky white and deep blue respectively. In this experiment, students observe what happens when a solution of ammonia is poured into each of three beakers, containing (unknown to the audience) small amounts of phenolphthalein, lead nitrate and copper(II) sulfate solution. RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation.
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