Properties of 2-(4-Nitrophenyl Azo)Cromotropic Acid Disodium Salt

Item name:2-(4-Nitrophenylazo)chromotropic acid disodium saltCAS:548-80-1
Molecular Formula:C16H9N3Na2O10S2
Formula Weight:513.37
Properties of 2-(4-Nitrophenyl Azo)Cromotropic Acid Disodium Salt:
Melting point:300 °C
Chemical property:dark green to dark purple crystalline powder
Use:Be a analytical determination for boric acid and borate.
Storage: Kept away from flammables area.

Chromotropic acid has the formula is (HO)2C10H4(SO3H)2.
It can be used for as a reagent in the quantitative determination of the systemic herbicide, 2,4-Dichlorophenoxyacetic acid.
The usefulness of this reagent in quantitative determination is the formation of a red colouration (peaking at 580 nm wavelength) when chromotropic acid in 75% sulfuric acid reacts with formaldehyde. The colouration is specific to this aldehyde and is not produced from other organic species such as ketones and carboxylic acids.


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