Turbidimetric Estimation of Alcohol Concentration in Aqueous-Alcohol Mixtures

被引：3

作者：

Swinehart, William E. ^{[1
]}

Zimmerman, Bonnie L. ^{[1
]}

Powell, Kinsey ^{[1
]}

Moore, Stephen D. ^{[1
]}

Iordanov, Tzvetelin D. ^{[1
]}

机构：

[1] Georgia Southwestern State Univ, Dept Chem, Americus, GA 31709 USA

来源：

JOURNAL OF CHEMICAL EDUCATION | 2014年 / 91卷 / 11期

关键词：

First-Year Undergraduate/General; Analytical Chemistry; Demonstrations; Interdisciplinary/Multidisciplinary; Hands-On Learning/Manipulatives; Alcohols; UV-vis Spectroscopy; Kinetics; Upper-Division Undergraduate; NUCLEATION; WATER;

D O I：

10.1021/ed400300j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A concept of the turbidimetric method for determining the concentration of ethanol in water-ethanol mixtures is described. A closed sample cell containing the analyte was heated to achieve vapor saturation and subsequent condensation. As the condensation occurred, the decrease in percentage transmittance with time due to light scattering was measured at 540 nm. Measurements of a single sample were performed for a period of 300 s. The rate of decrease of percentage transmittance versus the concentration of water-ethanol standard solutions was used to generate a calibration curve. The technique demonstrates the use of light scattering for analytical applications and provides an opportunity to teach basic nucleation concepts.

引用

页码：1947 / 1950

页数：4

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