Indigo carmine

Indigo carmine

Chembox new
ImageFile = Indigotine.png ImageSize =
ImageFile1 = Indigo-carmine-3D-balls.png ImageSize1 =
IUPACName = A name could not be generated for this structure.
OtherNames = 5,5'-indigodisulfonic acid sodium salt
Section1 = Chembox Identifiers
CASNo = 860-22-0
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = C16H8N2Na2O8S2
MolarMass = 466.36
Appearance = purple solid
Density =
MeltingPt = >300 °C
BoilingPt =
Solubility = 10 g/L (25 °C)
Section3 = Chembox Hazards
MainHazards =
FlashPt =
Autoignition =

Indigo Carmine, or 5,5'-indigodisulfonic acid sodium salt, is a pH indicator with the chemical formula C16H8N2Na2O8S2.

Uses

The primary use of Indigo carmine is as a pH indicator. It is blue at pH 11.4 and yellow at 13.0. Indigo carmine is also a redox indicator, turning yellow upon reduction. It is also used as a dye in the manufacturing of capsules.

Health concerns

Indigo carmine is harmful to the respiratory tract if swallowed. It is also an irritant to the skin and eyes. Proper laboratory cautions (Lab coat, gloves, goggles) are advised.

ee also

*Indigo dye

Sources

*http://physchem.ox.ac.uk/MSDS/IN/indigo_carmine.html
*http://www.jtbaker.com/msds/englishhtml/i1440.htm


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