(Science: chemical) carbonic acid (h2c03). The hypothetical acid of carbon dioxide and water. It exists only in the form of its salts (carbonates), acid salts (hydrogen carbonates), amines (carbamic acid), and acid chlorides (carbonyl chloride).
chemical name: carbonic acid
carbonic acid do exist - but it can not be isolatet as a compund it is in a dynamic equlibrium with CO2 + H2O =H2CO3 the ratio between H2CO3 and CO2 is 0.0021 or there is very little cabonic acid in water