A study on the apparent and partial molal volumes of n-Alkyl amine hydrochloride in water

[摘要] The apparent and partial molal volumes(¥Õvand V¡Æ) of a series of homologous n-alkylamine hydrochlorides CnH2n+1NH3+Cl-, where n varies from zero to four, have been determined by means of a float method at 30¡É to the fifth decimal place down to 0.01M in aqueous solutions. The experimental results indicate that the partial molal volumes of the salts are almost additive for successive homologues depending on the increment of molecular weight (CH2). It has been observed that the concentration dependence of the ¥Õv are linear in general and limiting slopes are positive and relatively close to the theoretical values. Anionic partial molal volume of chlorides anion V¢ªCl- is found to be 18.6 ml mole-1, which is in good agreement with the results of other workers. ¥Õv data also show that in solution the hydrophobic effect of ions are in competition with the charge effect, but the latter, that is, electrostriction seemed to be considerably predominant.

[学科分类] 化学（综合）