Thermo Scientific Chemicals Methyl Orange

Description

CAS: 547-58-0 | C14H14N3NaO3S | 327.334 g/mol

Methyl Orange is a pH indicator used in titrations for acids. It is also used for histological microscopy. Further, it is used as counter stain to crystal violet in staining pollen tubes.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Applications
Methyl Orange is a pH indicator used in titrations for acids. It is also used for histological microscopy. Further, it is used as counter stain to crystal violet in staining pollen tubes.

Solubility
Soluble in ethanol. Partially soluble in hot water. Slightly soluble in cold water and pyrimidine. Insoluble in ether and alcohol.

Notes
Incompatible with strong oxidizing agents.

Specifications

Chemical Identifiers

• CAS: 547-58-0
• Molecular Formula: C14H14N3NaO3S
• Molecular Weight (g/mol): 327.334
• MDL Number: MFCD00007502
• InChI Key: STZCRXQWRGQSJD-UHFFFAOYSA-M
• Synonym: Acid Orange 52; C.I. 13025
• PubChem CID: 23673835
• IUPAC Name: sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate
• SMILES: CN(C)C1=CC=C(C=C1)N=NC2=CC=C(C=C2)S(=O)(=O)[O-].[Na+]

• Melting Point: >300°C
• UN Number: UN3143
• Beilstein: 4732884
• Merck Index: 14,6105
• Solubility Information: Soluble in ethanol. Partially soluble in hot water. Slightly soluble in cold water and pyrimidine. Insoluble in ether and alcohol.
• Formula Weight: 327.34
• Odor: Weak, Characteristic
• pH: 6.5
• Quantity: 25 g
• Chemical Name or Material: Methyl Orange

Safety and Handling

Hazard Category	H301
Hazard Statement	GHS H Statement H301 Toxic if swallowed.
Precautionary Statement	P264b-P270-P301+P310-P330-P501c
DOTInformation	Transport Hazard Class: 6.1; Packing Group: III; Proper Shipping Name: DYES, SOLID, TOXIC, N.O.S.
EINECSNumber	208-925-3
RTECSNumber	DB6327000
TSCA	Yes
Recommended Storage	Ambient temperatures

SDS

RUO – Research Use Only