3737-95-9
3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid
CAS: 3737-95-9
Molecular Formula: C21H14N2O7S
3737-95-9 - Names and Identifiers
3737-95-9 - Physico-chemical Properties
| Molecular Formula | C21H14N2O7S |
| Molar Mass | 438.41 |
| Density | 1.60±0.1 g/cm3(Predicted) |
| Melting Point | 300°C(lit.) |
| Water Solubility | slightly soluble |
| Appearance | Powder |
| Color | Very dark purple to black |
| Odor | Odorless |
| BRN | 727492 |
| pKa | -0.50±0.40(Predicted) |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Use | As a complexing indicator for the determination of calcium |
3737-95-9 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 29270000 |
3737-95-9 - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Introduction | Calcium indicator is also called "calcium-carboxylic acid", scientific name "2-hydroxy-1-(2-hydroxy-4-sulfonic acid-1-naphthalene azo)-3-naphthoic acid", a double o-hydroxy azo color developer, purple red or brown crystalline powder. Easily soluble in sodium hydroxide and ammonia, slightly soluble in water and alcohol, its water and alcohol solution is unstable. The pH value in aqueous solution is blue in the range of 7.3~13.7, and can be used as an indicator for plasma complexation titration of calcium, magnesium, zinc, cadmium and manganese. The complex formed with calcium ions is red, the color change is sharp, and it is very obvious, so it is often used to determine calcium in the mixed system of calcium and magnesium. If there is iron and aluminum plasma in the solution, the indicator will be blocked and can be masked by the combination of potassium cyanide (KCN) and triethanolamine. |
| use | as a complexing indicator for calcium determination complexing indicator, calcium determination |
Last Update：2024-04-09 15:16:46
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