3-HYDROXY-4-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)NAPHTHALENE-2-CARBOXYLIC ACID

Name	3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid
Synonyms	Calconcarboxylic acid 2-hydroxy-1(2-hydroxy-4-sulfo-1-*naphthylazo)3-na 2,2-dihydroxy-4-sulpho-1,1-azonaphthalene-3-carboxylic acid 2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID 2-HYDROXY-1-(2-HYDROXY-4-SULPHO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID 2-HYDROXY-1-(2'-HYDROXY-4'-SULFO-1'-NAPHTHYLAZO)-3-NAPHTHOIC ACID 3-HYDROXY-4-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)NAPHTHALENE-2-CARBOXYLIC ACID 3-HYDROXY-4-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-2-NAPHTHALENECARBOXYLIC ACID 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid 2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-NAPHTHALENE-3-CARBOXYLIC ACID 2-Hydroxy[(2-hydroxy-4-sulpho-1-naphthalene)azo]naphthalene-3-carboxylicacid 2-naphthalenecarboxylicacid,3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)az 3-hydroxy-4-[2-(2-oxo-4-sulfonatonaphthalen-1(2H)-ylidene)hydrazino]naphthalene-2-carboxylate 3-hydroxy-4-[2-(2-oxo-4-sulfonaphthalen-1(2H)-ylidene)hydrazino]naphthalene-2-carboxylic acid 3-Hydroxy-4-(2-hydroxy-4-sulpho-1-naphthylazo)-2-naphthalenecarboxylic acid~Patton and Reeders 3-hydroxy-4-[(2Z)-2-(2-oxo-4-sulfonaphthalen-1(2H)-ylidene)hydrazino]naphthalene-2-carboxylic acid
CAS	3737-95-9
EINECS	223-117-0
InChI	InChI=1/C21H14N2O7S/c24-16-10-17(31(28,29)30)13-7-3-4-8-14(13)18(16)22-23-19-12-6-2-1-5-11(12)9-15(20(19)25)21(26)27/h1-10,23,25H,(H,26,27)(H,28,29,30)/p-2

Molecular Formula	C21H14N2O7S
Molar Mass	438.41
Density	1.60±0.1 g/cm3(Predicted)
Melting Point	300°C(lit.)
Water Solubility	slightly soluble
Appearance	Powder
Color	Very dark purple to black
Odor	Odorless
BRN	727492
pKa	-0.50±0.40(Predicted)
Stability	Stable. Incompatible with strong oxidizing agents.
Use	As a complexing indicator for the determination of calcium

Hazard Symbols	Xi - Irritant
Risk Codes	36/37/38 - Irritating to eyes, respiratory system and skin.
Safety Description	S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection
WGK Germany	3
TSCA	Yes
HS Code	29270000

EPA chemical information	Information provided by: ofmpub.epa.gov (external link)
Introduction	Calcium indicator is also called "calcium-carboxylic acid", scientific name "2-hydroxy-1-(2-hydroxy-4-sulfonic acid-1-naphthalene azo)-3-naphthoic acid", a double o-hydroxy azo color developer, purple red or brown crystalline powder. Easily soluble in sodium hydroxide and ammonia, slightly soluble in water and alcohol, its water and alcohol solution is unstable. The pH value in aqueous solution is blue in the range of 7.3~13.7, and can be used as an indicator for plasma complexation titration of calcium, magnesium, zinc, cadmium and manganese. The complex formed with calcium ions is red, the color change is sharp, and it is very obvious, so it is often used to determine calcium in the mixed system of calcium and magnesium. If there is iron and aluminum plasma in the solution, the indicator will be blocked and can be masked by the combination of potassium cyanide (KCN) and triethanolamine.
use	as a complexing indicator for calcium determination complexing indicator, calcium determination

Last Update：2024-04-09 15:16:46

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3-HYDROXY-4-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)NAPHTHALENE-2-CARBOXYLIC ACID Request for Quotation