Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Zeisel determination
Introduction
The Zeisel determination or Zeisel test is a chemical test for the presence of esters or ethers in a chemical substance [1] [2] [3]. In a qualitative test a sample is first reacted with a mixture of acetic acid and hydriodic acid in a test tube. The ensuing reaction results in the cleavage of the ether or the ester into an alkyl iodide and respectively an alcohol or an carboxylic acid.
By heating this mixture, the gases are allowed to come into contact with a piece of paper higher up the test tube saturated with mercury(II) nitrate. Any alkyl iodide present will give a reaction with the mercury compound to mercury(II) iodide which has a red or yellow color.
Synthetic applications: