Measuring instrument to obtain the electrical charge passed in an experiment, or to produce a known amount of substance in a titration.
Notes: - The silver coulometer is a primary reference measurement procedure for charge and current. By weighing the mass of silver deposited in a known time at constant current, the charge and current are calculated from Faraday’s laws of electrolysis.
- Modern instruments for measuring trace water by Karl Fischer titration use the passage of a measured charge to produce iodine from iodide solution. They are known as Karl Fischer coulometers.
See: coulometric titration
Source:
PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 682 (https://doi.org/10.1515/pac-2018-0109)