CHE 113 Study Guide - Final Guide: Marquis Reagent, Marsh Test, Concentration

• School: Syracuse University
• Department: Chemistry
• Course: CHE 113
• Professor: James Spencer

Document Summary

The science of obtaining, processing, and communicating information about the composition and structure of matter. First toxicological test: marsh test for arsenic (1832) used in the. Rapid screening to determine the likelihood of the presence of a chemical of interest in a sample. Include primarily physical tests with some classical (chemical tests) ex: marquis test. Can indicate the presence of the chemical in a sample with a high degree of certainty (less false positives or false negatives) Example: marquis test used to determine presence of cocaine, Uses gas to push components of a mixture through a tube coated with a reactive compound. The stronger the adsorption of a compound (affinity) on the stationary phase, the slower the component moves. = distance a solute moves/ distance the solvent moves. Defined only for a very specific set of conditions. Comparison of the area under the peaks can yield ratio of masses of the compounds in the sample (mass %)