- 1). Clamp an acid-proof laboratory beaker firmly to a worktop.
- 2). Place the metal in the beaker.
- 3). Prepare the nitric acid (HNO3) as a 68 percent solution.
- 4). Add the nitric acid slowly into the beaker with the metal.
- 5). Observe the results. These will vary depending on the metal used. The process which causes metals to dissolve is called oxidation. Some metals will dissolve completely, such as copper. Others, including chromium, iron and aluminum, quickly begin to dissolve but then form a metal oxide layer that protects them from further oxidation.
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