Coral reacts with acid. Corals consist of colonies of numerous very small animals called polyps. When polyps die, they secrete their exoskeletons of hard calcium carbonate (CaCo3). New polyps grow on top of the remains of former colonies. Over the years stony polyps can create massive coral reefs. Here a coral specimen is dropped into a beaker with 0.3 M hydrochloric acid (HCl). Carbon dioxide (CO2) bubbles are produced: CaCO3 + HCl -> CaCl2 + H2O + CO2. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Science Source / Turtle Rock Scientific |
Taille de l’image : | 3408 px × 5139 px |
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