Lamp acid
Lampic acid , also called acetylic acid, aldehydic acid and later also etheric acid, was a chemical compound postulated in the first half of the 19th century
- when heating some easily reducible metal oxides with aldehyde
- when heating platinum wire in ether or alcohol vapor
- with badly burning "alcohol lamps"
should arise. The word lamp acid is said to have its origin in the presence of this type of deposit on such lamps. The acid was assigned weakly acidic properties, irritating properties to the eyes and an unpleasant odor. However, different authors determined different molar masses and molecular formulas, so that an assignment of a structure was difficult. Ultimately, it turned out that the lamp acid is a mixture of acetic acid , acetaldehyde and formic acid that is variable in its compositionacted. Therefore a uniform elemental composition could never be found. Apart from encyclopedia entries, the term lamp acid practically disappeared from the chemical literature in the second half of the 19th century and is only used as a historical term.
Individual evidence
- ↑ P.Venghaus: observing a peculiar formation of lamp acid in Ann. Pharm. 8 (1833) 70-72, doi : 10.1002 / jlac.18330080111 .
- ↑ JF Daniell : Something else about the light bulb, about the flameless burning of types of gas and vapors, and about the so-called lamp acid in Ann. Phys. 75 (1823) 95-107.
- ↑ a b Pierer's Universal Lexikon, Volume 10. Altenburg 1860, p. 71 .
- ↑ a b J. Liebig : Aldehydic acid in Ann. Pharm. 13-14 (1835) 160-165.
- ↑ RF Marchand : About the formation of lamp acid in J. Prakt. Chem. 19 (1840) 57-59, doi : 10.1002 / prac.18400190107 .
- ↑ M. Martens: About the products of the slow combustion of alcohol and ether around a platinum wire in Archiv der Pharmazie 70 (1839) 181-188.
- ↑ A. Daniel: On the knowledge of lamp acid 1) About the nature of lamp acid in J. Prakt. Chem. 12 (1837) 321-332, doi : 10.1002 / prac.18370120151 .