AN OPTICAL METHOD FOR THE DETERMINATION OF MALIC AND TARTARIC ACIDS IN THE SAME SOLUTIONS.1

J. J. Willaman
1918 Journal of the American Chemical Society  
Calc. for NH(CsHJCO.COz(NHJ: total N, 15.38%. Found: 15.36%. Ammonium Phenylpropio1ate.-Phenylpropiolic acid, which contains a triple bond, is the first acid of its type whose ammonium salt has been studied in this laboratory. There is no record of the salt having been made elsewhere. A little heat was developed during the saturation with ammonia, which is an unusual occurrence with ether solutions. The salt is a pure white powder, having a slight odor. It is somewhat soluble in ethyl alcohol,
more » ... in ethyl alcohol, very soluble in methyl alcohol, and insoluble in chloroform, acetone, benzene and ether. An aqueous solution is neutral for about 2 hours, after which time it slowly hydrolyzes and gives an acid reaction. Moist air causes it to lose ammonia, but in dry air at 50' it remains unchanged for about I hour before it begins to lose ammonia slowly. The salt is not hygroscopic. It was precipitated in an ether solution of the free acid. Calc. for CsHsCi CC02(NH4): N, 8.59%. Found: 8.62%.
doi:10.1021/ja02237a013 fatcat:x6j75sjhlnfqppda4oijp2bzhu