2007-01-02 19:15:48 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
The ashes are of burnt seaweeds.
The product obtained after burning is known either as kelp or varec.
The kelp obtained is then lixiviated with water, which extracts the soluble salts, and the liquid is concentrated, when the less soluble salts, which are chiefly alkaline chlorides, sulphates and carbonates, crystallize out and are removed.
Sulphuric acid is now added to the liquid, and any alkaline sulphides and sulphites present are decomposed, while iodides and bromides are converted into sulphates, and hydriodic and hydrobromic acids are liberated and remain dissolved in the solution.
The liquid is run into the iodine still and gently warmed, manganese dioxide in small quantities being added from time to time, when the iodine distils over and is collected.
2007-01-02 19:35:34 · answer #1 · answered by kittycatkitty 2 · 0⤊ 0⤋
Lancenigo di Villorba (TV), Italy
KittyKat made it!
In XIX century, in war's times for French's kingdom, a french chemist (B. Courtois) discovered iodine's crystals after an sulphuric acid abuse on ashes's seaweeds. While he did his work, salpetriere, he overcame an importatnt scientific discovery.
Nonetheless overwritten, only his friendship with a known chemist (J. Thenard) he valued a public grant by French Scientific Academy.
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2007-01-03 04:15:05 · answer #2 · answered by Zor Prime 7 · 0⤊ 0⤋
from what ashes?
2007-01-03 03:23:46 · answer #3 · answered by judy_r8 6 · 0⤊ 0⤋