CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Reaction of copper and nitric acid. A copper penny removed from a beaker after reacting with nitric acid. Nitric acid (HNO3) is a clear liquid. When the copper in the penny reacts with it, green copper nitrate (CuNO3) solution is formed and brown nitrogen dioxide gas (NO2) is evolved.
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