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Indigo Carmine 10gr, or 5,5?-indigodisulfonic acid sodium salt, is an organic salt derived from indigo by sulfonation, which renders the compound soluble in water. It is approved for use as a food colorant in the U.S and E.U.
It is also a pH indicator.
Other names: Acid Blue 74; Indigocarmine; Indigotindisulfonate sodium. 3,3?-dioxo-2,2?-bisindolyden-5,5?-disulfonic acid disodium salt
C16H8N2Na2O8S2
M.W. : 466.346
CAS Number : 860 – 22 – 0
| NH4NO3 | |
| Molar mass | 80.043 g/mol |
| Appearance | white crystalline solid |
| Density | 1.725 g/cm3 (20 °C) |
| Melting point | 169.6 °C (337.3 °F; 442.8 K) |
| Boiling point | approx. 210 °C (410 °F; 483 K) decomposes |
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CAS Number |
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Chemical formula |
NH4SCN |
| Molar mass | 76.122 g/mol |
| Appearance | Colorless hygroscopic crystalline solid |
| Density | 1.305 g/cm3 |
| Melting point | 149.5 °C (301.1 °F; 422.6 K) |
| Boiling point | 170 °C (338 °F; 443 K) (decomposes) |
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Solubility in water |
128 g/100 mL (0 °C) |
| Solubility | soluble in liquid ammonia, alcohol, acetone |
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