* Zinc: Zinc reacts with citric acid to produce zinc citrate, a white, crystalline compound. The reaction is typically carried out in an aqueous solution, and it proceeds via the formation of a zinc-citrate complex.
* Gold: Gold does not react with citric acid under normal conditions. However, it can be dissolved in a solution of citric acid and hydrogen peroxide, which forms a gold-citrate complex. This complex can then be used to electroplate gold onto various surfaces.
* Copper: Copper reacts with citric acid to produce copper citrate, a blue-green, crystalline compound. The reaction is typically carried out in an aqueous solution, and it proceeds via the formation of a copper-citrate complex.
The reactivity of these metals with citric acid is influenced by various factors, such as the concentration of the citric acid solution, the temperature, and the presence of other ions in the solution.
