| Specifications | |
|---|---|
| Transition range | pH 3.1 - pH 4.4 pink - orange yellow |
| Appearance of solution | passes test |
| Loss on drying (110 °C) | ≤ 5 |
| Transition range (according to ACS) | passes test |
| Sensitivity test | passes test |
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Key Spec Table
| CAS # | EC Number | Hill Formula | Molar Mass | Grade Value |
|---|---|---|---|---|
| 547-58-0 | 208-925-3 | C₁₄H₁₄N₃NaO₃S | 327.34 g/mol | ACS,Reag. Ph Eur |
| Description | |
|---|---|
| Catalogue Number | 101322 |
| Synonyms | 4-Dimethylaminoazobenzene-4'-sulfonic acid sodium salt, Gold orange, Helianthine, Orange III |
| Product Information | |
|---|---|
| CAS number | 547-58-0 |
| EC number | 208-925-3 |
| Grade | ACS,Reag. Ph Eur |
| Hill Formula | C₁₄H₁₄N₃NaO₃S |
| Molar Mass | 327.34 g/mol |
| HS Code | 2927 00 00 |
| Structure formula Image | |
| Applications | |
|---|---|
| Application | Methyl orange (C.I. 13025) indicator ACS,Reag. Ph Eur. CAS 547-58-0, pH 6.5 (5 g/l, H₂O, 20 °C). MSDS and product info below. |
| Physicochemical Information | |
|---|---|
| Melting Point | >300 °C |
| pH value | 6.5 (5 g/l, H₂O, 20 °C) |
| Bulk density | 200 - 400 kg/m3 |
| Solubility | 5 g/l |
| Toxicological Information | |
|---|---|
| LD 50 oral | LD50 Rat 60 mg/kg |
| Safety Information according to GHS | |
|---|---|
| Hazard Pictogram(s) |  |
| Hazard Statement(s) | H301: Toxic if swallowed. |
| Precautionary Statement(s) | P308 + P310: IF exposed or concerned: immediately call a POISON CENTER or doctor/ physician. |
| Storage class | 6.1C Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects |
| WGK | WGK 3 highly water endangering |
| Disposal | 9 Carcinogenic compounds and flammable compounds labelled "Highly toxic" or "Toxic": container F. Alkyl sulfates are carcinogenic; Take particular care to avoid inhalation and skin contact. To neutralize alkyl sulfates, add dropwise (from a dropping funnel) to concentrated ice-cool Ammonia solution (Cat.No. 105426) with vigorous stirring. Before placing in container D, check the pH with pH Universal indicator strips (Cat.No. 109535). |
| Safety Information | |
|---|---|
| Hazard Symbols |  Toxic |
| Categories of danger | toxic |
| R Phrase | R 25 Toxic if swallowed. |
| S Phrase | S 37-45 Wear suitable gloves.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible). |
| Storage and Shipping Information | |
|---|---|
| Storage | Store at +5°C to +30°C. |
| Transport Information | |
|---|---|
| Declaration (railroad and road) ADR, RID | UN 2811 , 6.1, I |
| Declaration (transport by air) IATA-DGR | UN 2811 , 6.1, I |
| Declaration (transport by sea) IMDG-Code | UN 2811 , 6.1, I |
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