Thermo Scientific Chemicals Methyl Orange

Description

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
• Formula Weight: 327.34
• Odor: Weak, Characteristic
• pH: 6.5
• Quantity: 100 g
• Chemical Name or Material: Methyl Orange

Safety and Handling

Product Identifier

• Methyl Orange, ACS

Signal Word

• Danger

Hazard Category

• Acute toxicity Category 3

Hazard Statement

• H301-Toxic if swallowed.

Precautionary Statement

• P264-Wash thoroughly after handling.
• P270-Do not eat, drink or smoke when using this product.
• P301+P310-IF SWALLOWED: Immediately call a POISON CENTER/doctor /

Supplemental information

• MIXTURE LIST-Contains : C.I. Acid Orange 52

RUO – Research Use Only