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Antoine Lavoisier: the story on HearLore | HearLore
Antoine Lavoisier
Antoine-Laurent de Lavoisier was born on the 26th of August 1743 into a wealthy family of the nobility in Paris, inheriting a vast fortune at the age of five following the death of his mother. This inheritance allowed him to bypass the financial struggles that plagued most scientists of his era, granting him the freedom to pursue science full-time while living a life of comfort. He began his education at the Collège des Quatre-Nations, also known as the Collège Mazarin, in 1754, where his scientific interests were first ignited during his final two years of study. Under the tutelage of Abbé Nicolas Louis de Lacaille, a distinguished mathematician and astronomer, Lavoisier developed a lifelong enthusiasm for meteorological observation. Although he earned a law degree and was admitted to the bar in 1764, he never practiced law, choosing instead to dedicate his spare time to the study of chemistry, botany, astronomy, and mathematics. His early scientific work included a geological survey of Alsace-Lorraine conducted in June 1767 with Jean-Étienne Guettard, and by 1768 he had received a provisional appointment to the Academy of Sciences, marking the beginning of a career that would fundamentally alter the course of chemistry.
The Tax Farmer's Burden
At the age of 26, Lavoisier purchased a share in the Ferme générale, a tax farming financial company that advanced estimated tax revenue to the royal government in exchange for the right to collect taxes. This position provided him with the substantial income necessary to fund his scientific research and maintain his laboratory, but it also cast a long shadow over his legacy. The Ferme générale was one of the most hated components of the Ancien Régime, despised for the profits it extracted at the expense of the state, the secrecy of its contracts, and the violence of its armed agents. Lavoisier's involvement in tax collection became a political liability when the French Revolution erupted, as taxes and poor government reform were the primary motivators for the uprising. He also served as a commissioner of gunpowder starting in 1775, where he improved the quantity and quality of French munitions and trained Éleuthère Irénée du Pont, the founder of the Du Pont gunpowder business. His work on gunpowder and his role in the Ferme générale allowed him to live and work in a house and laboratory at the Royal Arsenal between 1775 and 1792, but these same positions would eventually lead to his downfall.
The Marriage of Science and Art
In 1771, at the age of 28, Lavoisier married Marie-Anne Pierrette Paulze, the 13-year-old daughter of a senior member of the Ferme générale. She was to play an indispensable role in his scientific career, translating English documents for him, including Richard Kirwan's Essay on Phlogiston and Joseph Priestley's research, and assisting him in the laboratory. Marie-Anne created many sketches and carved engravings of the laboratory instruments used by Lavoisier and his colleagues, which were essential for the publication of their scientific works. She edited and published Antoine's memoirs and hosted parties at which eminent scientists discussed ideas and problems related to chemistry. A portrait of the couple was painted by the famed artist Jacques-Louis David in 1788, but it was denied a customary public display at the Paris Salon for fear that it might inflame anti-aristocratic passions. Her contributions were so significant that she is now recognized as a chemist in her own right, and her work ensured that the visual and textual record of their experiments was preserved with remarkable precision.
Common questions
When was Antoine Lavoisier born and what was his family background?
Antoine-Laurent de Lavoisier was born on the 26th of August 1743 into a wealthy family of the nobility in Paris. He inherited a vast fortune at the age of five following the death of his mother, which allowed him to pursue science full-time without financial struggles.
What role did Marie-Anne Pierrette Paulze play in Antoine Lavoisier's scientific career?
Marie-Anne Pierrette Paulze was the 13-year-old daughter of a senior member of the Ferme générale whom Antoine Lavoisier married in 1771. She translated English documents for him, assisted in the laboratory, created sketches and engravings of instruments, and edited his memoirs to ensure the preservation of their experimental records.
How did Antoine Lavoisier disprove the phlogiston theory of combustion?
Antoine Lavoisier disproved the phlogiston theory by conducting quantitative chemical experiments that showed matter is neither lost nor created during chemical reactions. He demonstrated that combustion involves the combination of substances with oxygen, which he named in 1774, and established the law of conservation of mass through precise measurements.
Why was Antoine Lavoisier executed during the French Revolution?
Antoine Lavoisier was executed on the 8th of May 1794 in Paris because of his involvement in the Ferme générale, a hated tax farming company. He was convicted of defrauding the state and adding water to tobacco, leading to his guillotine death along with 27 co-defendants.
What major scientific discoveries did Antoine Lavoisier make regarding water and chemical nomenclature?
Antoine Lavoisier synthesized water by burning hydrogen and oxygen in 1783, proving it was a compound rather than an element. He also developed a new system of chemical nomenclature that defined oxygen as an essential constituent of all acids and introduced the concept of allotropy when discovering that diamond is a crystalline form of carbon.
During late 1772, Lavoisier turned his attention to the phenomenon of combustion, the topic on which he was to make his most significant contribution to science. He reported the results of his first experiments on combustion in a note to the Academy on the 20th of October, showing that when phosphorus burned, it combined with a large quantity of air to produce acid spirit of phosphorus, and that the phosphorus increased in weight on burning. In October 1774, the English chemist Joseph Priestley visited Paris and told Lavoisier of the air he had produced by heating the red calx of mercury, which supported combustion with extreme vigor. Lavoisier carried out his own research on this peculiar substance and concluded that it was a pure form of common air. The same year he coined the name oxygen for this constituent of the air, from the Greek words meaning acid former. He held that all acids contained oxygen and that oxygen was therefore the acidifying principle. This discovery directly opposed the prior phlogiston theory of combustion, which had dominated chemical thought for decades, and marked the beginning of the chemical revolution.
The Weight of Truth
Lavoisier's researches included some of the first truly quantitative chemical experiments, carefully weighing the reactants and products of a chemical reaction in a sealed glass vessel so that no gases could escape. In 1774, he showed that although matter can change its state in a chemical reaction, the total mass of matter is the same at the end as at the beginning of every chemical change. This principle, now known as the law of conservation of mass, was paraphrased from a statement in his Traité Élémentaire de Chimie: Nothing is lost, nothing is created, everything is transformed. Mikhail Lomonosov had previously expressed similar ideas in 1748, but Lavoisier's meticulous experiments and precise measurements, often to five to eight decimal places, provided the definitive proof needed to convince the scientific community. His work established the consistent use of the chemical balance and laid the foundation for the development of balanced physical and chemical reaction equations that are still used today. This quantitative approach transformed chemistry from a qualitative science into a precise, measurable discipline.
The Death of Phlogiston
In 1783, Lavoisier read to the academy his paper entitled Réflexions on Phlogiston, a full-scale attack on the current phlogiston theory of combustion. That year he also began a series of experiments on the composition of water, which were to prove an important capstone to his combustion theory and win many converts to it. In cooperation with Pierre-Simon Laplace, Lavoisier synthesized water by burning jets of hydrogen and oxygen in a bell jar over mercury. The quantitative results were good enough to support the contention that water was not an element, as had been thought for over 2,000 years, but a compound of two gases, hydrogen and oxygen. He named hydrogen in 1783, recognizing it as an element, and his experiments established water as a compound of oxygen and hydrogen with great certainty for those who viewed it. Despite these experiments, Lavoisier's antiphlogistic approach remained unaccepted by many other chemists, including Joseph Priestley and Richard Kirwan, who argued that quantification of substances did not imply conservation of mass. Nevertheless, his work dismantled the phlogiston theory and replaced it with a new understanding of combustion and chemical reactions.
The Execution of a Scientist
As the French Revolution gained momentum, attacks mounted on the deeply unpopular Ferme générale, and it was eventually abolished in March 1791. On the 24th of November 1793, the arrest of all the former tax farmers was ordered, and Lavoisier and the other Farmers General faced nine accusations of defrauding the state of money owed to it, and of adding water to tobacco before selling it. Lavoisier was convicted and guillotined on the 8th of May 1794 in Paris, at the age of 50, along with his 27 co-defendants. According to popular legend, the appeal to spare his life, in order that he could continue his experiments, was cut short by the judge, Coffinhal, who reportedly said: The Republic needs neither scholars nor chemists; the course of justice cannot be delayed. However, this quotation is likely apocryphal, as it was not recorded in contemporary accounts of his death. A year and a half after his execution, Lavoisier was completely exonerated by the French government, and a brief note was included with his belongings delivered to his widow, reading: To the widow of Lavoisier, who was falsely convicted. The loss of his life was mourned by his colleague Joseph-Louis Lagrange, who lamented: It took them only an instant to cut off this head, and a hundred years might not suffice to reproduce its like.
The Legacy of Precision
Lavoisier's fundamental contributions to chemistry were a result of a conscious effort to fit all experiments into the framework of a single theory. He established the consistent use of the chemical balance, used oxygen to overthrow the phlogiston theory, and developed a new system of chemical nomenclature which held that oxygen was an essential constituent of all acids. His Traité élémentaire de chimie, published in 1789, represents the synthesis of his contribution to chemistry and can be considered the first modern textbook on the subject. The work presented a unified view of new theories of chemistry, contained a clear statement of the law of conservation of mass, and denied the existence of phlogiston. He also contributed to early ideas on composition and chemical changes by stating the radical theory and introduced the possibility of allotropy in chemical elements when he discovered that diamond is a crystalline form of carbon. His pioneering work in physiological processes, including the study of respiration as a slow combustion process, inspired similar research for generations. Following his death, a collection comprising most of his scientific manuscripts and instruments was established by his relatives at the Château de la Canière in Puy-de-Dôme, and Mount Lavoisier in New Zealand's Paparoa Range was named after him in 1970.