Volumetric Properties of Some Aliphatic Mono- and Dicarboxylic Acids in Water at 298.15 K

摘要

The apparent molar volumes, V _φ , of two series of homologous aliphatic carboxylic acids, H(CH₂) _n COOH [n=0–5] and (CH₂) _n (COOH)₂ [n=0–5], were determined in dilute aqueous solutions by density measurements at T=298.15 K. Densities were measured using a vibrating-tube densimeter (DMA 5000, Anton Paar, Austria) at T=298.15 K. These results were used to calculate the apparent molar volumes of each solute over the concentration range 0.0050≤m/(mol⋅kg−1)≤0.3000. Values of the apparent molar volumes of undissociated acids V_f(u)0V_{phi (u)}^{0} were also calculated. The variation of V_f(u)0V_{phi (u)}^{0} was determined as a function of the aliphatic chain length of the studied carboxylic acids.