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68250 Sigma-Aldrich

Methyl Orange

for microscopy (Hist.), indicator (pH 3.0-4.4)

Synonym: 4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Helianthin, Orange III

  • CAS Number 547-58-0

  • Empirical Formula (Hill Notation) C14H14N3NaO3S

  • Molecular Weight 327.33

  •  Colour Index Number 13025

  •  Beilstein/REAXYS Number 4732884

  •  EC Number 208-925-3

  •  MDL number MFCD00007502

  •  PubChem Substance ID 329760496

  •  NACRES MA.02

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Properties

Related Categories Analytical Reagents, Analytical/Chromatography, Indicators, Microscopy Reagents, Redox Indicators,
Quality Level   200
grade   for microscopy (Hist.)
  indicator (pH 3.0-4.4)
form   powder
application(s)   hematology: suitable
  histology: suitable
  titration: suitable
pH range   3.0 - 4.4, pink to yellow
solubility   methanol: water (1:1): 0.1 g/10 mL, orange to very deep orange
λmax   501.4 nm in H2O (acidified)
Featured Industry   Diagnostic Assay Manufacturing
storage temp.   room temp
SMILES string   [Na+].CN(C)c1ccc(cc1)\N=N\c2ccc(cc2)S([O-])(=O)=O
InChI   1S/C14H15N3O3S.Na/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);/q;+1/p-1/b16-15+;
InChI key   STZCRXQWRGQSJD-GEEYTBSJSA-M

Description

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.

Safety & Documentation

Safety Information

Symbol 
GHS06  GHS06
Signal word 
Danger
Hazard statements 
RIDADR 
UN 3143PSN1 6.1 / PGIII
WGK Germany 
WGK 3
RTECS 
DB6327000
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Protocols & Articles

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References

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