Description: Nitric acid plus copper gives nitric oxide in an exothermic reaction. The expanding gas displaces water from another flask; when the gas cools, the water is drawn back into the flask, dissolving the nitric oxide and forming a blue solution with the copper ions still there.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 3 page: 83

Keywords: Coin-operated Demonstration, Nitric Acid, Copper, Rube Goldberg Demonstration