What acid destroys copper?

When copper meets nitric acid: A colorful chemical showdown

If you have ever wondered what happens when a sturdy metal like copper faces the right chemical challenger, the answer is both dramatic and visually striking. While common household acids like vinegar or lemon juice won't make a dent, nitric acid is a completely different story.

When concentrated nitric acid comes into contact with copper—such as an old copper penny—a fierce reaction unfolds. Rather than just gently fading away, the acid aggressively oxidizes the metal, immediately releasing a cloud of dense, red-brown nitrogen dioxide gas. It is an intense process that looks as powerful as it sounds.

As the reaction progresses, the solid copper completely dissolves into the liquid, transforming the clear acid into a vibrant, striking blue solution made of copper nitrate. It remains one of the most classic and visually impressive demonstrations of chemistry in action, showing how specialized oxidizing acids can completely break down materials that usually resist standard corrosion.