2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID
CAS: 3737-95-9
Molecular Formula: C21H14N2O7S
2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID - Names and Identifiers
2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID - 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) |
| Storage Condition | RT, dark, 12 months |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Use | This product is for scientific research only and shall not be used for other purposes. |
| Caution | The color change of the end point is: red-blue. |
2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID - 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 |
2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID - Introduction
Metal ion indicator, calcium ion indicator
Last Update：2022-10-16 17:37:41
2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | calcium indicator is also called "calcium-carboxylic acid", the scientific name "2-hydroxy-1-(2-hydroxy-4-sulfonyl-1-naphthazo)-3-naphthoic acid", a kind of BIS-o-hydroxy azo color reagent, magenta or brown crystalline powder. Soluble in sodium hydroxide and ammonia, slightly soluble in water and alcohol, its water and alcohol solution is not stable. In aqueous solution pH value is 7.3~13.7 in the range of blue, can be used as calcium, magnesium, zinc, cadmium, manganese plasma Complexometric titration indicator. The complex formed with calcium ions is red, the color change is sharp and very obvious, so it is commonly used in the determination of calcium in the mixed system of calcium and magnesium. If there is iron and aluminum plasma in the solution, the indicator will be blocked, which can be masked by the combination of potassium cyanide (KCN) and triethanolamine. |
| Use | as a complexation indicator for the determination of Calcium complexation indicator, determination of Calcium |
Last Update：2024-04-10 22:29:15
