Carbazide

In chemistry, a carbazide is a functional group with the general formula RNH-NH(C=O)NH-NHR. They can be derived from the condensation of carbonic acid with a hydrazine. Carbohydrazide is the simplest carbazide, with another common carbazide being diphenylcarbazide, which is used as an analytical reagent.[1]

Carbohydrazide, the simplest carbazide
Diphenylcarbazide

Diphenylcarbazide forms an intense blue color with chromium in the hexavalent state. It has an absorptivity coefficient about 3400. That means very small amounts of chromium can be detected; 25 micrograms in 25 mL of solution are too dark to read on a spectral device, so concentrations well below that can be detected.

Thiocarbazide

The sulfur analog is called a thiocarbazide, of which thiocarbohydrazide is the simplest example.

Carbazone and thiocarbazone

A carbazone is a partially oxidized carbazide with the general formula R=NNH(C=O)NH-NHR. The sulfur analog is called a thiocarbazone, of which dithizone is an example.

gollark: Personally, I think that local public transport and short-range intra-city electric cars would be worth considering.
gollark: Batteries' energy density isn't that great right now, sadly.
gollark: Also, they cause pollution indirectly, much like electric cars, although less.
gollark: Not travelling with another person.
gollark: You also have to be:- by yourself- within a short distance of where you want to go- okay with lower speed- not carrying large things

See also

References
  1. Crossley, H. E. (1936). "Diphenylcarbazide. An internal indicator for use in the titration of iron with dichromate". The Analyst. 61 (720): 164. Bibcode:1936Ana....61..164C. doi:10.1039/AN9366100164.
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