1.01322

Methyl orange (C.I. 13025)

pH indicator, ACS, Reag. Ph Eur

• Synonym(s): Methyl orange (C.I. 13025), 4-Dimethylaminoazobenzene-4′-sulfonic acid sodium salt, Gold orange, Helianthine, Orange III
• Empirical Formula (Hill Notation): C₁₄H₁₄N₃NaO₃S
• CAS Number: 547-58-0
• Molecular Weight: 327.33
• MDL number: MFCD00007502
• UNSPSC Code: 12352107
• EC Index Number: 208-925-3
• NACRES: NA.05

Properties

• product name: Methyl orange (C.I. 13025), indicator ACS,Reag. Ph Eur
• grade: ACS reagent
• Quality Level: 200
• agency: reag. Ph. Eur.
• form: solid
• potency: 60 mg/kg LD₅₀, oral (Rat)
• loss: ≤5% loss on drying, 110°C
• pH: 6.5 (20 °C, 5 g/L in H₂O)
• mp: >300 °C
• bulk density: 200‑400 kg/m³
• storage temp.: 2-30°C
• InChI: 1S/C14H15N3O3S/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20/h3-10H,1-2H3,(H,18,19,20)/p-1
• InChI key: IETWCRRCPURZOC-UHFFFAOYSA-M

Description

Application

• Plant-assisted green preparation of silver nanoparticles using leaf extract of Dalbergia sissoo and their antioxidant, antibacterial and catalytic applications.: This research utilized Methyl Orange as an indicator in the green synthesis of silver nanoparticles using Dalbergia sissoo leaf extract. The study highlighted its catalytic application in dye degradation, demonstrating the environmental benefits of plant-assisted nanoparticle synthesis (Khatun et al., 2024).
• Dye Degradation and Sulfur Oxidation of Methyl Orange and Thiophenol via Newly Designed Nanocomposite GQDs/NiSe-NiO Photocatalyst Under Homemade LED Light.: This study focused on the efficient photocatalytic degradation of Methyl Orange using a novel nanocomposite photocatalyst under LED light, presenting significant advancements in photocatalytic materials for wastewater treatment (Srivastava et al., 2023).
• Bryophyllum pinnatum leaf extract mediated ZnO nanoparticles with prodigious potential for solar driven photocatalytic degradation of industrial contaminants.: The research demonstrated the synthesis of ZnO nanoparticles using Bryophyllum pinnatum leaf extract and their application in the photocatalytic degradation of Methyl Orange, showcasing a sustainable approach to tackling industrial pollutants (Dhiman et al., 2023).
• Light driven Aspergillus niger-ZnS nanobiohybrids for degradation of methyl orange.: This paper explored the use of Aspergillus niger-ZnS nanobiohybrids for the degradation of Methyl Orange, emphasizing the potential of biogenic approaches in enhancing photocatalytic efficiency (Priyanka & Lens, 2022).
• Bacterially driven cadmium sulfide precipitation on porous membranes: Toward platforms for photocatalytic applications.: This study utilized Methyl Orange to assess the photocatalytic efficiency of cadmium sulfide precipitated on porous membranes by bacteria, proposing a novel method for creating photocatalytic platforms for environmental applications (Marusak et al., 2018).

Analysis Note

Transition range: pH 3.1 - pH 4.4pink - orange yellow
Appearance of solution: passes test
Loss on drying (110 °C): ≤ 5
Transition range (according to ACS): passes test
Sensitivity test: passes test

Safety Information

• pictograms: GHS06
• signalword: Danger
• hcodes: H301
• pcodes: P264 - P270 - P301 + P310 - P405 - P501
• Hazard Classifications: Acute Tox. 3 Oral
• Storage Class: 6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable