How you would show that seashells contain carbonates?

To demonstrate that seashells contain carbonates, you can perform an acid test. Take a small sample of the seashell and add a few drops of hydrochloric acid (HCl) to it. If carbonates are present, you will observe effervescence or bubbling, which indicates the release of carbon dioxide gas as the acid reacts with the carbonate minerals in the shell. This reaction confirms the presence of carbonates in the seashells.