Orthocarbonic acid is the hypothetical acid with the chemical formula H₄CO₄. In this molecule, a single carbon atom is bonded to four hydroxyl groups. This compound is hypothetical because not even one molecule of this acid has ever been shown to exist. This is because it is highly unstable, decomposing into carbon dioxide and water. This acid is tetraprotic (has four dissociable protons), and thus could form four types of salts, as demonstrated by the series NaH₃CO₄, Na₂H₂CO₄, Na₃HCO₄, and Na₄CO₄. The analogous orthosilicic acid is well known. Other examples of hypothetical compounds so unstable as not to have been shown to exist are ammonium nitride, (NH₄)₃N, and bromine hepta-fluoride, BrF₇. In databases, ACID stands for Atomicity, Consistency, Isolation, and Durability. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Hydroxide is a functional group consisting of oxygen and hydrogen: -O−H It has a charge of 1-. The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. ... Carbon dioxide is an atmospheric gas composed of one carbon and two oxygen atoms. ... Water (from the Old English word wæter and the German word Wasser) is a colorless, tasteless, and odorless substance in its pure form that is essential to all known forms of life and is known also as the most universal solvent. ... For alternative meanings see proton (disambiguation). ... Silicic acid is a general name for a family of chemical compounds of silicon, hydrogen and oxygen, with the general formula [SiOx(OH)4-2x]n. ... Fumes from hydrochloric acid and ammonia forming a white cloud of ammonium chloride The Ammonium cation is a positively charged polyatomic ion of the chemical formula NH4+ and a molecular mass of 18. ... Nitrides are binary salt-like compounds of nitrogen, usually with metals. ... General Name, Symbol, Number bromine, Br, 35 Series halogens Group, Period, Block 17 (VIIA), 4, p Density, Hardness 3119 kg/m3 (300 K), NA Appearance Gas: red-brown solid: metallic luster Atomic properties Atomic weight 79. ... Hepta- is a prefix indicating seven of something. ... A fluoride ion is the ionic form of fluorine. ...