ETHYL ORANGE Chemical Properties

Melting point:

>300°C

storage temp. 

room temp

solubility 

Very soluble in water; very slightly soluble in ethanol

pka

4.34(at 25℃)

form 

Powder

color 

Orange

PH Range

Red (3.4) to yellow (4.8)

Water Solubility 

H2O: 1mg/mL

ε(extinction coefficient)

≥29000 at 473-477nm in deionized water
≥8000 at 274-282nm in deionized water

λmax

474nm

BRN 

3821641

Major Application

Lithographic plate preparation, holographic storage, hybrid materials, inks, surface probes, diagnostic agents for diseases related with amyloid accumulation

InChI

InChI=1S/C16H19N3O3S.Na.H/c1-3-19(4-2)15-9-5-13(6-10-15)17-18-14-7-11-16(12-8-14)23(20,21)22;;/h5-12H,3-4H2,1-2H3,(H,20,21,22);;/b18-17+;;

InChIKey

JIQMFPYPPUEBQO-QIKYXUGXSA-N

SMILES

N(C1C=CC(/N=N/C2C=CC(S(O)(=O)=O)=CC=2)=CC=1)(CC)CC.[NaH]

CAS DataBase Reference

62758-12-7(CAS DataBase Reference)

EPA Substance Registry System

Benzenesulfonic acid, 4-[[4-(diethylamino)phenyl]azo]-, sodium salt (62758-12-7)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36-24/25

WGK Germany 

3

TSCA 

Yes

HS Code 

29270000

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

ETHYL ORANGE Usage And Synthesis

Chemical Properties

orange crystalline powder

Uses

Indicator: pH 3.0 (red) to pH 4.5 (yellow)

Purification Methods

Recrystallise it twice from water. [Beilstein 16 IV 511.]

ETHYL ORANGE(62758-12-7)Related Product Information

• Benzenesulfonic acid
• Ethyl Orange, indicator grade, pure,Ethyl orange Benzenesulfonic acid, 4-[(4-diethylamino)phenylazo]-, potassium salt
• ETHYL ORANGE
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• 4-ETHYLMETHYLAMINOAZOBENZENE