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Sulfanilic acid CAS#121-57-3
CAS Number: 121-57-3
Chemical Formula: C6H7NO3S
Synonyms:
Diazobenzenesulfonic acid test solution(ChP)
SULFANILIC ACID ANHYD PWD
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Appearance: White Powder
Sulfanilic acid (4-amino benzene sulfonic acid ) is an off-white crystalline solid which finds application in quantitative analysis of nitrate and nitrite ions. The solid acid exists as a zwitterion, and has an unusually high melting point.
Sulfanilic acid Chemical Properties |
Melting point | >300 °C(lit.) |
Boiling point | 288 ℃ |
bulk density | 620kg/m3 |
density | 1.485 |
vapor pressure | 0Pa at 25℃ |
refractive index | 1.5500 (estimate) |
storage temp. | Store below +30°C. |
solubility | 10g/l |
pka | 3.24(at 25℃) |
form | solid |
color | White to Off-White |
PH | 2.5 (10g/l, H2O, 20℃) |
Water Solubility | 0.1 g/100 mL (20 ºC) |
Merck | 14,8926 |
BRN | 908765 |
Stability: | Stable. Incompatible with strong oxidizing agents. |
InChI | 1S/C6H7NO3S/c7-5-1-3-6(4-2-5)11(8,9)10/h1-4H,7H2,(H,8,9,10) |
InChIKey | HVBSAKJJOYLTQU-UHFFFAOYSA-N |
SMILES | Nc1ccc(cc1)S(O)(=O)=O |
LogP | -2.3 at 25℃ |
CAS DataBase Reference | 121-57-3(CAS DataBase Reference) |
NIST Chemistry Reference | Benzenesulfonic acid, 4-amino-(121-57-3) |
EPA Substance Registry System | Sulfanilic acid (121-57-3) |
Safety Information |
Hazard Codes | C,Xi |
Risk Statements | 36/38-43-34 |
Safety Statements | 26-36/37/39-45-37-24-36/37 |
RIDADR | UN 2790 8/PG 3 |
WGK Germany | 1 |
RTECS | WP3895500 |
Autoignition Temperature | >400 °C |
TSCA | TSCA listed |
HS Code | 29214210 |
Storage Class | 11 - Combustible Solids |
Hazard Classifications | Eye Irrit. 2 |
Hazardous Substances Data | 121-57-3(Hazardous Substances Data) |
Toxicity | LD50 orally in Rabbit: 12300 mg/kg |
Product Application of Sulfanilic acid CAS#121-57-3
As the compound readily form diazo compounds, it is used to make dyes and sulpha drugs . This property is also used for the quantitative analysis of nitrate and nitrite ions by diazonium coupling reaction with N-(1-Naphthyl) ethylene diamine , resulting in an azo dye, and the concentration of nitrate or nitrite ions were deduced from the color intensity of the resulting red solution by colorimetry.
It is also used as a standard in combustion analysis.
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