Adsorção e propriedades de volume de misturas binárias água álcool: um experimento didático com base em medidas de tensão superficial

Resumo

An undergraduate physical chemistry experiment based on the drop counting method for surface tension measurements is proposed to demonstrate adsorption isotherms of binary aqueous solutions of ethanol, n-propanol, and n-butanol. Excess surface is obtained by the derivative of surface tension taken with respect to alcohol activity, after this activity calculation using van Laar equation. Laboratory class contents are surface tension, excess surface, percolation of hydrogen bonds, micelle, activity, and ideal solution.

Descrição

Palavras-chave

Alcohol-water mixtures, Adsorption isotherm, Physical chemistry lab course

Citação

SANTOS, Michelly C. dos et al. Adsorção e propriedades de volume de misturas binárias água álcool: um experimento didático com base em medidas de tensão superficial. Química Nova, São Paulo, v. 33, n. 7, p. 1598-1602, jul. 2010.