China supplier OEM Diethyl L(+)-Tartrate for Libya Importers
CAS NO.：87-91-2 Name：D(-)-Tartaric Acid Function：
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A small amount of yellow-green powder (p-nitroaniline) is placed in a crucible and 1 ml of concentrated sulfuric acid is added while being heated with a bunsen flame inside a fume cupboard. After warming the contents for several minutes, a black carbon snake or column sponge suddenly appears.
This demonstration must be performed in a working fume cupboard. The reaction shows how effective a dehydrating agent conc. sulfuric acid is. The rapid production of gases (mainly carbon dioxide, nitrogen, NOx, water vapour and probably some sulfur dioxide) causes the expansion of the melted p-nitroaniline which grows into a carbon sponge column (the other remaining product) in a blink of an eye.
By Christine 2016-9-29 19:19
A good manufacturers, we have cooperated twice, good quality and good service attitude.
By Emma 2016-3-28 12:27