Near Infrared Absorption of Solutions of Hydroxides and Hydrolyzing Salts

Absorption bands have been observed at 2.60 mu, 2.30 mu, 1.81 mu, 1.30 mu, 1.22 mu, 1.04 mu, 0.87 mu, 0.79 mu, 0.75 mu and 0.67 mu in aqueous solutions of hydroxides and hydrolyzing salts. From the behavior of the salt solutions the bands at 2.60 mu and 1.81 mu were found to be characteristic of the hydroxide molecule, while the band at 2.30 mu was found to be characteristic of the OH ion. It was found that if the 2.30 mu band, and the 3.65 mu and 5.20 mu bands previously observed were considered as fundamentals, the remaining bands observed could be classified as harmonics.