(organic chemistry) A colourless syrupy organic compound, CH₂OH.CHOH.COOH, formed by the oxidation of glycerol or glyceraldehyde.

(chemistry) a solution of hydrogen iodide, HI, in water; it is a strong acid and reducing agent

(organic chemistry) The simplest carboxylic acid, HCOOH, a colourless, corrosive liquid with a sharp odour; it is present in the stings of ants, bees and nettles, and is prepared industrially by the oxidation of methanol or formaldehyde; it has some industrial uses, and its esters, the formates are used in perfumes.

(organic chemistry) An organic compound, C₆H₁₂O₇, formed by oxidizing the aldehyde functional group of glucose into a carboxylic acid; used as a food additive; any glucosyl derivative of this compound

(chemistry) A solution of hydrogen fluoride, HF, in water; it is a weak but very corrosive acid, used in the production of fluorine compounds, and in metallurgy.

Alternative spelling of hydrosulfurous acid

(chemistry) an alternative name for hyposulfurous acid

(chemistry) Alternative spelling of hyposulfurous acid

(inorganic chemistry) An unstable acid, H₂S₂O₃, formally derived from sulfuric acid by the substitution of a sulfur atom in the place of an oxygen one; it is known only in solution or as its salts and esters, the thiosulfates.

(chemistry, obsolete) Hydrocyanic acid.