Rinse and dry to finish the job. Ketchup works because it contains both acid and salt, the two ingredients needed to dissolve copper oxide.

A salt is made by the neutralisation of an acid with a base. Speaker one Our base in this case is copper oxide which will react with sulfuric acid to give us copper sulfate and water.

There are three distinct steps when preparing a dry sample of a soluble salt from an insoluble oxide or carbonate and dilute acid: filtration, evaporation, crystallisation.

If your copper cookware has made the inevitable change from shiny to tarnished, grab a cloth and a jar of pickles from your pantry, and get to wiping.

Bowden and Moore1 studied this reaction by putting stearic acid monolayers on radioactive copper and measuring the activity which could be removed by extraction with benzene.

In the case of copper, the solution used is a weak sulphuric acid similar to that used for typical heap leaching of copper oxides.

Researchers at the Tokyo University of Science have shown that using copper can eliminate defects in sodium manganese oxide battery types, boosting battery cycle life.

Scientists have developed a novel one-step process using, for the first time in these types of syntheses, potassium superoxide to rapidly form oxide nanoparticles from simple salt solutions in water.