Pierre-Joseph Macquer
Who was Pierre-Joseph Macquer?
French chemist
Biographical data adapted from Wikipedia’s article on Pierre-Joseph Macquer (CC BY-SA 4.0).
Biography
Pierre-Joseph Macquer (9 October 1718 – 15 February 1784) was a French chemist who made important contributions to both theoretical and applied chemistry, making him one of the leading scientific figures in eighteenth-century France. Born and educated in Paris, he trained at the University of Paris, where he gained the medical and scientific knowledge that shaped his career. He progressed steadily through the French Academy of Sciences, becoming an adjunct Chemist on 5 April 1745, advancing to Associate Chemist in 1766, and finally receiving the permanent Chair of Chemistry in 1772. These appointments showed the high esteem in which his peers held his systematic approach to chemical research.
Macquer's contributions to theory were significant. His 1749 work Elemens de Chymie Theorique expanded on Geoffroy's 1718 affinity table and included a whole chapter on chemical affinity. In this text, Macquer claimed that a basic attraction or agreement determined how different chemical substances could combine with one another, which he believed explained nearly all observable chemical phenomena. This idea laid the groundwork for later systematic thinking about chemical reactions, even as the field was set to change dramatically.
Beyond theory, Macquer was heavily involved in practical and industrial chemistry. He worked as a chemist for the Manufacture de Sèvres and the Gobelins Manufactory, aiding in the development of French porcelain production. His work also extended to medicine and various manufacturing industries, aligning with the Enlightenment ideal of using science for national economic and cultural progress. In 1752, he showed that the pigment Prussian blue could be broken down by alkaline solutions into a solid iron hydroxide compound and a solution of ferrocyanide, an important discovery for understanding compound substances and their components.
Macquer is also well-known for his Dictionnaire de chymie, published in 1766, which became a major reference work in chemistry. The dictionary organized chemical knowledge of the time in an accessible way and was translated and used across Europe. Despite his achievements, Macquer disagreed with Antoine Lavoisier's new theories, which would eventually change chemistry with the concepts of oxygen and the conservation of mass. This put Macquer among the traditional chemists who struggled to adapt decades of phlogiston-based thinking to Lavoisier's new ideas.
Macquer received international recognition during his lifetime. In 1768, he was elected a foreign member of the Royal Swedish Academy of Sciences, and in 1775 he became a member of the American Philosophical Society. His brother, the scholar Philippe Macquer, shared his intellectual interests. Macquer died in Paris on 15 February 1784, leaving behind work that had shaped French chemistry during a crucial period of scientific change. The compound monopotassium arsenate, known as Macquer's salt and with the formula KH2AsO4, was named in his honor, ensuring a lasting mention in chemical names.
Before Fame
Pierre-Joseph Macquer was born in Paris in 1718 when French scientific institutions were establishing their authority, and the Enlightenment was starting to transform intellectual life across Europe. He studied at the University of Paris, earning qualifications in medicine while also developing an interest in chemistry. In the early eighteenth century, chemistry was caught between practical craft and emerging science, and ambitious young scholars like Macquer were eager to organize it.
His rise to prominence was influenced by the intellectual environment in France, which valued both theoretical rigor and practical application of knowledge. The French Academy of Sciences offered a vital institutional base for such ambitions, and Macquer's election as adjunct Chemist in 1745 was his formal entry into the highest level of French scientific life. His early writings, especially Elemens de Chymie Theorique in 1749, showed he had both the scholarly grounding and the broad vision to significantly contribute to organizing chemical knowledge.
Key Achievements
- Published the Dictionnaire de chymie (1766), a landmark reference work that systematized chemical knowledge for European audiences
- Demonstrated in 1752 that Prussian blue could be chemically decomposed into iron hydroxide and ferrocyanide
- Advanced the theory of chemical affinity in his 1749 Elemens de Chymie Theorique, building on and extending Geoffroy's affinity table
- Appointed to the permanent Chair of Chemistry at the French Academy of Sciences in 1772
- Contributed to the development of French porcelain through applied chemical work at the Manufacture de Sèvres
Did You Know?
- 01.Macquer's salt, the compound monopotassium arsenate (KH2AsO4), was named in his honor, preserving his name in chemical nomenclature long after his death.
- 02.In 1752, Macquer discovered that Prussian blue, a widely used pigment, could be broken down by alkaline solutions into iron hydroxide and a ferrocyanide solution, one of the earliest analyses of a complex inorganic compound.
- 03.His Dictionnaire de chymie (1766) was one of the first comprehensive chemical dictionaries and was translated into multiple European languages, making it a standard reference across the continent.
- 04.Macquer worked directly with the Manufacture de Sèvres and the Gobelins Manufactory, applying his chemical expertise to improve French porcelain and textile dyeing industries.
- 05.Despite being one of the most respected chemists in France, Macquer remained a critic of Lavoisier's oxygen theory until the end of his life, representing a significant intellectual divide within French chemistry.