Welcome to Tangshan Moneide Trading Co., Ltd.
Moneide Chemicals
Tel: 0086-315-8309571
WhatsApp/WeChat/Mobile: 0086-15633399667
Skype: janet-honest
Mail: sales@moneidechem.com
Address: 2-7-523 Jidong Building Materials Commercial Center, Tangshan, Hebei 064000 China
Methyl Orange Indicator - High Purity, Clear Color Change
- Time of issue:Oct . 11, 2025 13:30
(Summary description)Tangshan Moneide Trading Co., Ltd. is a trading company specializing in the export of fine chemical products in China. Over the years, we have established good cooperative relations with many outstanding chemical production enterprises in China, and actively cooperated in research and development on some products. Our company's product series mainly include: electroplating chemicals, organic& inorganic fluoro chemicals, organic intermediate chemicals, phase transfer catalyst and Indicator or Biological stain .
- Categories:Company dynamic
- Author:
- Origin:
- Time of issue:2019-12-30 10:55
- Views:
I’ve worked around analytical labs long enough to know that methyl orange looks deceptively simple—an old-school indicator with surprisingly modern staying power. To be honest, despite automation and photometric endpoints, it’s still the go-to when you need a bright, unambiguous transition in acidic titrations. And yes, I still keep a bottle near the burette.
Industry trend, quick take: labs want cleaner endpoints, fewer hazardous components, and tighter lot-to-lot consistency. Surprisingly, methyl orange ticks those boxes—sharp transition (≈pH 3.1–4.4), inexpensive, and stable in dry form. Many customers say they prefer the fast, high-contrast red-to-yellow flip over broader-range indicators, especially in carbonate titrations and QA checks in water treatment.
Origin: 2-7-523 Jidong Building Materials Tangshan, Hebei 064000 China. Compliance options: ISO 9001 QMS; COA & SDS supplied; REACH status on request.
Materials and method (simplified): diazotization of sulfanilic acid → azo coupling with N,N-dimethylaniline → neutralization to sodium salt → filtration → recrystallization → vacuum drying.
Advantages: sharp endpoint, intense color, low cost, compatible with standard burette workflows. Caveat: not ideal for weak acid/weak base titrations or strong oxidizers (can bleach).
Hebei water plant QA: swapped to methyl orange indicator solution made weekly; endpoint drift dropped, and audit time shortened by 12%. University teaching lab: students reported clearer endpoints vs. mixed indicators—fewer over-titrations, which, I guess, saves both nerves and titrant.
Avoid dust; wear goggles and gloves; keep container111s light-protected. Dispose per local regs. Request SDS and COA with lot-specific data.
Why methyl orange still matters in 2025
Technical specifications (lab-grade)
Product name
Methyl orange (indicator)
CAS No.
547-58-0
Synonyms
Acid Orange 52; Orange III; CI 13025; sodium 4-[(4-dimethylamino)phenylazo]benzenesulfonate
Formula / MW
C14H14N3NaO3S / 327.33 g·mol⁻1
Transition range
≈ pH 3.1 (red) to 4.4 (yellow)
λmax (H2O)
≈ 463–465 nm (real-world use may vary with solvent/ionic strength)
Purity
≥ 99.0% (HPLC), heavy metals ≤ 10 ppm typical
Appearance
Orange-red crystalline powder
Storage / Service life
RT, light-protected; shelf life ≈ 24 months sealed; indicator solution ≈ 6 months
Process flow, quality, and testing
Applications and advantages
Vendor comparison (typical market view)
Vendor
Purity / Grade
MOQ
Typical lead time
Compliance
Price range (≈)
MoneideChem (China)
≥99%, indicator grade
100 g
7–10 days ex-works
ISO 9001; COA/SDS
Budget-friendly
Sigma-Aldrich/Merck
≥99%, ACS
25 g
Stock/short
ISO; extensive docs
Premium
Alfa Aesar/Thermo
≥98–99%
25 g
Stock/short
ISO; COA
Mid–high
Customization & packaging
Real-world notes (mini case files)
Safety & handling
Moneide Chemicals
