Friedrich Wöhler

Chapter 1 · A Year With Berzelius

A physician who never practised, learning to weigh

1800 – 1825 · Eschersheim · Marburg · Heidelberg · Stockholm

Friedrich Wöhler was born in July 1800 at Eschersheim near Frankfurt. His father was a veterinary surgeon and estate manager, and encouraged the boy's collecting and experimenting; Wöhler had a laboratory in the family house as a schoolboy and was making his own oxygen and studying minerals in his teens.

He studied medicine at Marburg and then Heidelberg, taking his degree in 1823 with a thesis on the passage of substances into the urine — which is a small irony given what happened five years later.

His teacher at Heidelberg, Leopold Gmelin, told him he would be wasted in medicine and should go to Stockholm and work with Berzelius, the most authoritative chemist in Europe.

He went, and spent a year there in 1823 and 1824. Berzelius put him to work on analysis, and Wöhler later said the year gave him the working habits of his life: patience with a balance, distrust of a single measurement, and the conviction that a result is worth having only when it has been repeated.

The two became close. Wöhler translated Berzelius's textbook and annual reviews into German for decades, and they corresponded until Berzelius's death.

He never practised medicine at all.

In 1825 he took a teaching post at a technical school in Berlin, where he had a laboratory and a great deal of freedom, and began working on cyanates.

“I can make urea without needing a kidney, whether of man or of dog.”

— Friedrich Wöhler, letter to Jöns Jacob Berzelius, 22 February 1828

Why this matters

Wöhler's year with Berzelius gave him the analytical discipline that made an accidental result recognisable rather than merely puzzling.

You have the year in Stockholm. What would you ask him?

Ask Wöhler

• “What did Berzelius actually teach you?”
• “Why train as a physician and never practise?”
• “What did you have in your laboratory as a schoolboy?”
• “Why spend decades translating another man's textbook?”
• “What is worth repeating a measurement for?”

Chapter 2 · Trying to Make Something Else

22 February 1828

1828 · Berlin

Wöhler was trying to prepare *ammonium cyanate*, a straightforward inorganic salt, by combining silver cyanate with ammonium chloride, or lead cyanate with ammonia.

He got crystals. They were not ammonium cyanate. They did not behave like a salt: they gave no reaction for ammonia or for cyanate, and they did not conduct.

He analysed them and recognised what they were. Urea — the compound the mammalian kidney excretes, the principal nitrogenous waste of the body, first isolated from urine in the 1770s and unmistakably a product of a living animal.

He had made it from silver cyanate and ammonium chloride. Neither had ever been alive.

He wrote to Berzelius on 22 February 1828 with the line the textbooks quote: that he could make urea without needing a kidney, whether of man or of dog.

The accepted view at the time divided chemistry sharply in two. There was the mineral world, whose substances could be made in a laboratory. And there was the organic world, whose compounds were held to require a *vital force* — *Lebenskraft* — present only in living things. On that view, an organic compound could be extracted from a living source or degraded, but never built up from mineral materials.

Wöhler had built one.

And he did not claim to have overturned vitalism. He was careful about it in print, and in later years he became actively irritated by the version of the story that credited him with destroying the doctrine in a single stroke.

Why this matters

Wöhler was not looking for urea, did not claim to have destroyed vitalism, and spent later years correcting the story told about his own experiment.

You have the crystals that were the wrong compound. What is your question?

Ask Wöhler

• “What were you actually trying to make?”
• “How did you know the crystals were urea?”
• “What was the vital force supposed to be?”
• “Why did you object to the story told about you?”
• “Why write to Berzelius first?”

Chapter 3 · Vitalism Did Not Collapse in 1828

What actually happened over the following forty years

1828 – 1870s · Berlin · Göttingen · Stockholm

The tidy version says Wöhler made urea and vitalism died. It is not what happened, and the real story is more useful.

First, defenders had an answer ready. Urea, they pointed out, is a *waste product* — the end of metabolism, not a component of living tissue. And Wöhler's starting materials, the cyanates, were themselves derived ultimately from animal material such as horn and blood. So the vital force might still be lurking in the ingredients.

Second, Berzelius — Wöhler's own teacher, the man he wrote to — was *not* persuaded. He found the result interesting and remained a vitalist.

Third, Wöhler himself made no strong claim.

What actually ended vitalism was accumulation, over about forty years. Hermann Kolbe synthesised acetic acid from its elements in 1845. Marcellin Berthelot systematically synthesised methane, methanol, ethanol, benzene and a range of fats and sugars in the 1850s and 1860s, starting from elements, and wrote explicitly that organic chemistry needs no vital force. By the 1870s the doctrine had no serious defenders in chemistry.

So 1828 is a *beginning*, not an ending — the first case, the one that showed the boundary might be crossed, followed by four decades of demonstrating that it could be crossed at will.

That is worth teaching accurately, because the tidy version gives a false picture of how doctrines actually fall. They very rarely collapse from a single decisive blow. They erode.

Why this matters

Vitalism took forty years and dozens of syntheses to die, not one experiment — and that is how established doctrines usually fall.

You have the doctrine that took four decades to go. What would you ask?

Ask Wöhler

• “How did vitalists answer your urea result?”
• “Why was Berzelius not persuaded?”
• “Who actually finished vitalism off?”
• “Do doctrines ever fall in a single blow?”
• “Was urea a fair test at all?”

Chapter 4 · The Same Atoms, and a Different Substance

Isomerism, and why a formula is not enough

1824 – 1830 · Berlin · Giessen

Wöhler thought this the more important discovery, and he was probably right.

In 1824 he analysed silver *cyanate*. In 1825 Justus von Liebig, working independently, analysed silver *fulminate*.

The two compounds could hardly be more different in behaviour. Silver cyanate is unremarkable. Silver fulminate detonates violently on the slightest friction — it is the basis of percussion caps.

And on analysis they gave *exactly the same composition*: the same elements, in the same proportions by mass.

The first reaction was that one of them must have made a mistake, and the two young men had a sharp exchange. They repeated the analyses. Both were right.

Berzelius named the phenomenon *isomerism* in 1830.

The consequence is enormous, and it is why organic chemistry is what it is. If two substances can share a composition and differ completely, then *composition does not determine identity*. Something else must differ — and the only candidate is the *arrangement* of the atoms.

So a molecular formula, however accurately determined, is not sufficient to identify a compound. C₂H₆O could be ethanol, which you can drink, or dimethyl ether, which is a gas. Same atoms. Different arrangement. Different substance.

That forced chemistry to develop a way of representing *structure* — which is why a modern chemistry student draws molecules rather than merely writing them, and why Kekulé's structural formulae became indispensable thirty years later.

The dispute also turned Wöhler and Liebig into lifelong friends and collaborators. In 1832 they published together on the benzoyl radical, and worked together for fifty years.

Why this matters

Isomerism is why a chemistry student draws molecules instead of only writing formulae: composition cannot identify a compound, so arrangement must be represented.

You have two identical compositions and two different substances. What is your question?

Ask Wöhler

• “How different are silver cyanate and silver fulminate?”
• “What must be different if the composition is the same?”
• “Did you and Liebig accuse each other of error?”
• “Why does this force chemists to draw molecules?”
• “Which discovery of yours mattered more?”

Chapter 5 · The Laboratory at Göttingen

Aluminium, acetylene, and a generation of chemists

1836 – 1882 · Göttingen

In 1836 Wöhler took the chair of chemistry at Göttingen, and stayed forty-six years.

He built a teaching laboratory on the Giessen model — students at their own benches, doing analyses with their own hands — and it became one of the great training grounds of nineteenth-century chemistry. Something like eight thousand students passed through, including Georg Ludwig Carius, Heinrich Limpricht, Rudolph Fittig, Adolph Kolbe and the young Augustus Voelcker.

His own work continued across an unusual range. He isolated *aluminium* as a metal in 1827 by reducing aluminium chloride with potassium — obtaining a grey powder, and later, with a better method, small globules — at a time when aluminium was so difficult to obtain that it was more valuable than gold and Napoleon III reportedly used aluminium cutlery for his most honoured guests. He isolated *beryllium* the following year and worked on *yttrium* and *titanium*.

He prepared *calcium carbide* and obtained *acetylene* from it by adding water — the basis of the carbide lamp, and for a long period the industrial route to acetylene.

With Liebig he investigated uric acid and its derivatives, and the benzoyl radical, showing that a group of atoms could pass unchanged through a series of reactions — an important step toward the idea of structure.

He married twice; his first wife and cousin Franziska died young, leaving two children, and he had four more with his second wife Julie.

He declined to enter the structural chemistry that Kekulé and others built on his own findings, saying it belonged to a younger generation.

He died at Göttingen in September 1882, aged eighty-two.

Why this matters

Wöhler isolated aluminium when it was more valuable than gold, and trained something like eight thousand students in a laboratory built on the Giessen model.

You have the laboratory, the metals and the students. What would you ask him?

Ask Wöhler

• “How valuable was aluminium when you first made it?”
• “What does a teaching laboratory do that lectures cannot?”
• “Why leave structural chemistry to the next generation?”
• “What did fifty years of working with Liebig give you?”
• “Which of your students went furthest?”

What Wöhler changed

The 1828 urea synthesis is taught everywhere as the moment the wall between organic and inorganic chemistry began to come down, though Wöhler insisted it came down slowly and not by his hand alone. The discovery of isomerism has aged better still: it is why organic chemistry had to become a study of structure rather than of composition, and why every formula on a modern syllabus is drawn rather than merely written.

A debate that continues

Whether the urea synthesis genuinely refuted vitalism is contested — the starting materials derived from animal sources, urea is a waste product rather than a tissue component, and Berzelius himself was not persuaded. Vitalism took another forty years and many further syntheses to die.

Keep exploring — ask Wöhler

• “Which accidental result taught you most?”
• “How should a discovery be described when the story grows?”
• “What would you have drawn if you had had structural formulae?”

Related lives

• Jöns Jacob Berzelius — Who Gave Chemistry Its Alphabet
• Justus von Liebig — Who Weighed What Burned Away
• August Kekulé — Who Gave Carbon Four Hands
• Marcellin Berthelot — Who Named the Heat Both Ways

Related themes

Organic chemistry · Isomers · Synthesis