Methyl Orange
SIAL/68250 - for microscopy (Hist.), indicator (pH 3.0-4.4)
Synonym: 4-
CAS Number: 547-58-0
Empirical Formula (Hill Notation): C14H14N3NaO3S
Molecular Weight: 327.33
EC Number: 208-925-3
MDL Number: MFCD00007502
Linear Formula: C14H14N3NaO3S
Product Type: Chemical
| λmax | 501.4 nm in H2O (acidified) |
| application(s) | diagnostic assay manufacturing hematology histology |
| form | powder |
| grade | for microscopy (Hist.) |
| indicator (pH 3.0-4.4) | |
| InChI | 1S/C14H15N3O3S.Na/c1-17(2 |
| InChI key | STZCRXQWRGQSJD-GEEYTBSJSA |
| pH | 3.0-4.4, pink to yellow |
| Quality Level | 200  |
| SMILES string | [Na+].CN(C)c1ccc(cc1)N=N |
| solubility | methanol: water (1:1): 0.1 g/10 mL, orange to very deep orange |
| storage temp. | room temp |
| technique(s) | titration: suitable |
| General description: | Methyl orange is an orange colored synthetic dye, which undergoes a change in color depending on the pH of the solution. It basically develops a red color in acidic solution and yellow color in basic solution. |
| Symbol |  GHS06 |
| Signal word | Danger |
| Hazard statements | H301 |
| Precautionary statements | P264 - P270 - P301 + P310 - P405 - P501 |
| Hazard Codes | T |
| Risk Statements | 25 |
| Safety Statements | 45 |
| RIDADR | UN 3143PSN1 6.1 / PGIII |
| WGK Germany | WGK 3 |
| Flash Point(F) | Not applicable |
| Flash Point(C) | Not applicable |
| Storage Temp. | room temp |
| Colour Index Number | 13025 |
| UNSPSC | 12171500 |