Carboxylic acid carbonyl functionalities such as ketone as well as moderately reactive ester, olefin, nitrile, and halide moieties. Carboxylic acid A carboxylic acid is an organic compound that contains a carboxyl group (C(=O)OH). The general formula of a carboxylic acid is R–COOH, with R referring to the rest of the (possibly quite large) molecule. Carboxylic acids occur widely and include the amino acids (which make up proteins) and acetic acid (which is part of vinegar and occurs in metabolism). Salts and esters of carboxylic acids are called carboxylates. When a carboxyl group is deprotonated, its conjugate base forms a carboxylate anion. Carboxylate
Hexafluorosilicic acid Hexafluorosilicic acid Hexafluorosilicic acid is an inorganic compound with the chemical formula (also written as ). It is a colorless liquid rarely encountered undiluted. Hexafluorosilicic acid has a distinctive sour taste and pungent smell. It is produced naturally on a large scale in volcanoes. It is manufactured as a precursor to aluminum trifluoride and synthetic cryolite. It is commonly used as a source of fluoride for water fluoridation. Salts derived from hexafluorosilicic acid are called hexafluorosilicates. In aqueous solution, the hydronium cation (HO) is traditionally equated with a solvated proton, and as such, the formula for this compound is often