Ethyl Orange Sodium Salt is an organic azo dye and pH indicator with the chemical formula C₁₆H₁₈N₃NaO₃S. It is the sodium salt of Ethyl Orange and has a characteristic orange coloration. The azo structure and sulfonate group contribute to its color and water solubility while its pH-sensitive behavior allows it to change color in response to changes in acidity. It shows a red to orange color transition over approximately pH 3.0–4.8 making it suitable for monitoring acidic conditions in analytical procedures.
CAS No.: 62758-12-7
Synonyms: 4-(4-Diethylaminophenylazo)benzenesulfonic acid sodium salt.
| Physical Properties | |
| Chemical formula | C16H18N3NaO3S |
| IUPAC Name | sodium 4-[[4-(diethylamino)phenyl]diazenyl]benzenesulfonate |
| Molecular weight | 355.4 g/mol |
| Solubility | Soluble in water |
| Appearance | Orange Powder |
| Storage | Store at room temperature |
| Chemical Properties | |
| Color | Dark red to brown |
| Physical State | Solid |
| λmax | 474 nm |
| Odor | Odorless |
| Pictograms : |  |
| Hazard Statements : | H315: Causes skin irritation. H319: Causes serious eye irritation. H335: May cause respiratory irritation. |
| Precautionary Statements: | P261: Avoid breathing dust/fume/gas/mist/vapours/spray. P280: Wear protective gloves. P302+P352: IF ON SKIN: Wash with plenty of soap and water. P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P312: Call a POISON CENTRE/doctor if you feel unwell. P403+P233: Store in a well-ventilated place. Keep container tightly closed. P501: Dispose of contents/container to industrial combustion plant. |
Ethyl Orange Sodium Salt is an organic azo dye and pH indicator with the chemical formula C₁₆H₁₈N₃NaO₃S. It is the sodium salt of Ethyl Orange and has a characteristic orange coloration. The azo structure and sulfonate group contribute to its color and water solubility while its pH-sensitive behavior allows it to change color in response to changes in acidity. It shows a red to orange color transition over approximately pH 3.0–4.8 making it suitable for monitoring acidic conditions in analytical procedures.
CAS No.: 62758-12-7
Synonyms: 4-(4-Diethylaminophenylazo)benzenesulfonic acid sodium salt.
| Physical Properties | |
| Chemical formula | C16H18N3NaO3S |
| IUPAC Name | sodium 4-[[4-(diethylamino)phenyl]diazenyl]benzenesulfonate |
| Molecular weight | 355.4 g/mol |
| Solubility | Soluble in water |
| Appearance | Orange Powder |
| Storage | Store at room temperature |
| Chemical Properties | |
| Color | Dark red to brown |
| Physical State | Solid |
| λmax | 474 nm |
| Odor | Odorless |
| Pictograms : | |
| Hazard Statements : | H315: Causes skin irritation. H319: Causes serious eye irritation. H335: May cause respiratory irritation. |
| Precautionary Statements: | P261: Avoid breathing dust/fume/gas/mist/vapours/spray. P280: Wear protective gloves. P302+P352: IF ON SKIN: Wash with plenty of soap and water. P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P312: Call a POISON CENTRE/doctor if you feel unwell. P403+P233: Store in a well-ventilated place. Keep container tightly closed. P501: Dispose of contents/container to industrial combustion plant. |
Ethyl Orange Sodium Salt is mainly used as a pH indicator in titrations and analytical chemistry. It is also used as an azo dye in selected research and textile applications.
Ethyl Orange and Methyl Orange are different azo dyes. Although both can function as pH indicators but they have different chemical structures and indicator properties.
Ethyl Orange Sodium Salt is also known as Ethyl Orange (Sodium) or Ethyl Orange sodium salt. Its chemical formula is C₁₆H₁₈N₃NaO₃S with a molecular weight of approximately 355.39 g/mol.
