DENSITIES AND MOLAL VOLUMES OF N-ALKYLAMINES FROM 15-DEGREES-C TO 80-DEGREES-C

Densities of seven n-alkylamines from 1-butylamine to 1-decylamine wer e determined from 15 to 80 degrees C. The density was found to be a li near function of the temperature within this temperature range. At con stant temperature, the molal volume was a linear function of the numbe r of methylene units in the chain for the homologous series. A simple equation with four constants correlating the molal volume with the num ber of methylene units and temperature of the n-alkylamines was formul ated. Excellent agreement between the calculated, the measured and the literature values were obtained. Accurate molal volumes, and hence th e densities of any n-alkylamines, other than methylamine, within the t emperature range can be calculated from the equation.