alpha-Naphtholphthalein

Description

Indicator in 0.1% or 0.04% alcohol solution | CAS: 596-01-0 | C28H18O4 | 418.448 g/mol

Indicator in 0.1% or 0.04% alcohol solution.α-Naphtholphthalein is used as a pH indicator and operates in the pH ranges between 7.3 and 8.7. It is also used in the designing of optical carbon dioxide sensor based on fluorescence intensity.

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.

Specifications

Chemical Identifiers

• CAS: 596-01-0
• Molecular Formula: C28H18O4
• Molecular Weight (g/mol): 418.448
• MDL Number: MFCD00036202
• InChI Key: HQHBAGKIEAOSNM-UHFFFAOYSA-N
• Synonym: alpha-naphtholphthalein, naphtholphthalein, 1-naphtholphthalein, a-naphtholphthalein, 3,3-bis 4-hydroxynaphthalen-1-yl isobenzofuran-1 3h-one, unii-2qeg1706nn, 1 3h-isobenzofuranone, 3,3-bis 4-hydroxy-1-naphthalenyl, naphtholphthalein blue, alpha-naphtholphtalein, 3,3-bis 4-hydroxy-1-naphthyl phthalide
• PubChem CID: 68993
• IUPAC Name: 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one
• SMILES: C1=CC=C2C(=C1)C(=CC=C2O)C3(C4=CC=CC=C4C(=O)O3)C5=CC=C(C6=CC=CC=C65)O

• Melting Point: 238°C to 240°C
• Color: Brown
• Quantity: 1 g
• Merck Index: 14,6389
• Solubility Information: Soluble in ethanol. Insoluble in water.
• Formula Weight: 418.45
• Physical Form: Powder
• Chemical Name or Material: alpha-Naphtholphthalein

Safety and Handling

Hazard Category	Warning
Hazard Statement	GHS H Statement H315-H319-H335 Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statement	GHS P Statement P261-P280-P305+P351+P338-P304+P340-P405-P501a Avoid breathing dust/fume/gas/mist/vapors/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.
EINECSNumber	209-875-5
TSCA	No
Recommended Storage	Ambient temperatures

SDS

RUO – Research Use Only