Titration

Lore & Background

The word 'titration' descends from the French word 'tiltre' (1543), meaning the proportion of gold or silver in coins, i.e., a measure of fineness or purity. 'Tiltre' became 'titre', meaning the 'fineness of alloyed gold', and then the 'concentration of a substance in a given sample'. In 1828, French chemist Joseph Louis Gay-Lussac first used 'titre' as a verb ('titrer'), meaning 'to determine the concentration of a substance in a given sample'.

Volumetric analysis originated in late 18th-century France. French chemist François-Antoine-Henri Descroizilles developed the first burette (similar to a graduated cylinder) in 1791. Gay-Lussac developed an improved version of the burette that included a side arm, and invented the terms 'pipette' and 'burette' in an 1824 paper on the standardization of indigo solutions. The first true burette was invented in 1845 by French chemist Étienne-Ossian Henry. A major improvement and popularization of volumetric analysis was due to Karl Friedrich Mohr, who redesigned the burette into a simple and convenient form and wrote the first textbook on the topic, 'Lehrbuch der chemisch-analytischen Titrirmethode', published in 1855.

Reader's Guide

Titration is a foundational technique in quantitative chemical analysis, enabling precise determination of analyte concentration through controlled addition of a titrant. Its development over the late 18th and 19th centuries, particularly by French chemists Descroizilles, Gay-Lussac, and Henry, and later by German chemist Mohr, established the modern burette and standardized procedures. The method's significance lies in its versatility across acid–base, redox, and other reaction types, with titration curves providing visual insight into reaction progress and equivalence points. The careful selection of indicators, such as phenolphthalein or methyl orange, minimizes error, while techniques like buffer addition or heating accommodate specific reactions. Titration remains essential in laboratories worldwide for applications from pharmaceutical analysis to environmental testing, embodying a blend of historical innovation and practical utility.

Did You Know?

• The word 'titration' descends from the French word 'tiltre' (1543), meaning the proportion of gold or silver in coins.
• François-Antoine-Henri Descroizilles developed the first burette in 1791.
• Karl Friedrich Mohr wrote the first textbook on titration, published in 1855.
• In an acid–base titration, the equivalence point for a strong acid and strong base results in a very steep pH change near the equivalence point.