Preparation of carboxylic acids from salts of nitroketones

A method of preparing a carboxylic acid which comprises contacting an ammonium, Group IA or Group IIA metal salt of a nitroketone corresponding to the formula:

• ##STR5## where R is an alkyl group of from 1 to 25 carbon atoms, where R.sup.1 is hydrogen or an alkyl group of from 1 to 25 carbon atoms, where Me is NH.sub.4, a Group IA metal or a Group IIA metal and where n is 1 to 2, at a temperature of about 20.degree. to 100.degree. C. with from 10 to 100 parts by weight of water per part by weight of said nitroketone salt in the presence of an acidic mineral acid salt, wherein said acidic salt is ammonium chloride, ammonium nitrate, ammonium sulfate, ammonium hydrogen sulfate, ammonium phosphate or calcium nitrate, where the mole ratio of said nitroketone salt to said acidic salt is from about 1:0.01 to 1:2.