Thermo Scientific Chemicals Methyl Orange

Product Code	Brand	Quantity
11488227	Thermo Scientific Chemicals A17604.22	100 g
11498227	Thermo Scientific Chemicals A17604.36	500 g

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.

Chemical Identifiers

• CAS: 547-58-0
• Molecular Weight (g/mol): 327.334
• InChI Key: STZCRXQWRGQSJD-UHFFFAOYSA-M
• PubChem CID: 23673835
• SMILES: CN(C)C1=CC=C(C=C1)N=NC2=CC=C(C=C2)S(=O)(=O)[O-].[Na+]

• Molecular Formula: C14H14N3NaO3S
• MDL Number: MFCD00007502
• Synonym: Acid Orange 52; C.I. 13025
• IUPAC Name: sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate

Specifications

• Melting Point: >300°C
• Molecular Formula: C14H14N3NaO3S
• UN Number: UN3143
• Merck Index: 14,6105
• InChI Key: STZCRXQWRGQSJD-UHFFFAOYSA-M
• IUPAC Name: sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate
• PubChem CID: 23673835
• Odor: Weak, Characteristic
• Chemical Name or Material: Methyl Orange

• CAS: 547-58-0
• MDL Number: MFCD00007502
• Beilstein: 4732884
• Synonym: Acid Orange 52; C.I. 13025
• SMILES: CN(C)C1=CC=C(C=C1)N=NC2=CC=C(C=C2)S(=O)(=O)[O-].[Na+]
• Molecular Weight (g/mol): 327.334
• Formula Weight: 327.34
• pH: 6.5

Safety and Handling

GHS H Statement
H301
Toxic if swallowed.

GHS P Statement
P264-P270-P301+P310-P321-P405-P501a
Wash thoroughly after handling.
Do not eat, drink or smoke when using this product.
IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
Specific treatment (see label).
Store locked up.
Dispose of contents/container in accordance with local/regional/national/international regulations.

Danger

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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

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RUO – Research Use Only