Volumetric Titrations Using Electrolytically Generated Reagents for the Determination of Ascorbic Acid and Iron in Dietary Supplement Tablets: An Undergraduate Laboratory Experiment

被引：5

作者：

Scanlon, Christopher ^{[1
]}

Gebeyehu, Zewdu ^{[1
]}

Griffin, Kameron ^{[1
]}

Dabke, Rajeev B. ^{[1
]}

机构：

[1] Columbus State Univ, Dept Chem, Columbus, GA 31907 USA

来源：

JOURNAL OF CHEMICAL EDUCATION | 2014年 / 91卷 / 06期

基金：

美国国家科学基金会;

关键词：

Second-Year Undergraduate; Upper-Division Undergraduate; Analytical Chemistry; Laboratory Instructions; Hands-On Learning/Manipulatives; Acids/Bases; Aqueous Solution Chemistry; Electrochemistry; Electrolytic/Galvanic Cells/Potentials; Reactions; COULOMETRIC TITRATION;

D O I：

10.1021/ed400630u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An undergraduate laboratory experiment for the volumetric quantitative analysis of ascorbic acid and iron in dietary supplement tablets is presented. Powdered samples of the dietary supplement tablets were volumetrically titrated against electrolytically generated reagents, and the mass of dietary reagent in the tablet was determined from the volume of potassium hydrogen phthalate solution used as a primary standard. Proposed electrolysis cell was directly powered by a 9 V battery eliminating the requirement of a coulometer. Students use this method to quantify the active ingredient in dietary supplement tablets: iron and ascorbic acid (vitamin C). The experiment is suitable for the undergraduate quantitative analysis laboratory.

引用

页码：898 / 901

页数：4