George de Hevesy and Aqua Regia

When it comes to SMBC jokes, one must be care­ful to dis­tin­guish between the satire, and the true situ­ation that may as well have been satire.

Today’s case on George de Hevesy is one of those strange but true tales.


As Hevesy him­self describes in Adven­tures in Radioiso­tope Research: The Col­lec­ted Papers of George Hevesy in Two Volumes:

My work was inter­rup­ted for only one day dur­ing the enemy occu­pa­tion of Den­mark. When on the morn­ing of Denmark’s occu­pa­tion, I arrived in the labor­at­ory, I found Bohr wor­ry­ing about Max von Laue’s Nobel medal, which Laue had sent to Copen­ha­gen for safe-keeping. In Hitler’s empire it was almost a cap­ital offence to send gold out of the coun­try, and, Laue’s name being engraved into the medal, the dis­cov­ery of this by the invad­ing forces would have had very ser­i­ous con­sequences for him. (Three years later the invad­ing army occu­pied Bohr’s insti­tute.) I sug­ges­ted that we should bury the medal, but Bohr did not like this idea as the medal might be unearthed. I decided to dis­solve it. While the invad­ing forces marched in the streets of Copen­ha­gen, I was busy dis­solv­ing Laue’s and also James Frank’s medals. After the war, the gold was recovered and the Nobel Found­a­tion gen­er­ously presen­ted Laue and Franck with new Nobel medals.

Aqua regia (Latin for “royal water”) is so named because it is able to dis­solve the so-called royal metals which includes gold as the Hevesy story elu­cid­ates so well.

It is com­posed of nitric acid and hydro­chloric acid, which indi­vidu­ally, would be as harm­ful to gold as water. Nitric acid oxid­izes a tiny amount of gold, form­ing Au3+. Hydro­chloric acid read­ily sup­ply chlor­ide ions (Cl-) that react with Au3+ to form chloraur­ate anions (AuCl4-). When gold ions are removed, more gold can then be oxid­ized, until we have a jar of green­ish or brown­ish look­ing liquid that is good enough to befuddle Nazis.

Thanks to the fine folks at the Uni­ver­sity of Not­ting­ham, you can watch the entire pro­cess on video explained by the most stereotypical-looking sci­ent­ist in existence.

No word yet on the dollhouse.

  • mark roy paguyod
    Unknown browser

    hevesy.…what a bril­liant mind! that even niels had not thought about it…