Calconcarboxylic acid

Calconcarboxylic acid Basic information

Product Name:	Calconcarboxylic acid
Synonyms:	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-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)-3-NAPHTHOIC ACID;2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID;2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-NAPHTHALENE-3-CARBOXYLIC ACID;2-HYDROXY-1-(2-HYDROXY-4-SULPHO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID
CAS:	3737-95-9
MF:	C21H14N2O7S
MW:	438.41
EINECS:	223-117-0
Product Categories:	Analytical Chemistry;Azo Compounds;Chelating Reagents;Naphthylazo Compounds
Mol File:	3737-95-9.mol

Calconcarboxylic acid Chemical Properties

Melting point	300 °C(lit.)
density	1.60±0.1 g/cm3(Predicted)
form	Powder
pka	-0.50±0.40(Predicted)
color	Very dark purple to black
Odor	Odorless
Water Solubility	slightly soluble
BRN	727492
Stability:	Stable. Incompatible with strong oxidizing agents.
CAS DataBase Reference	3737-95-9(CAS DataBase Reference)
EPA Substance Registry System	2-Naphthalenecarboxylic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]- (3737-95-9)

Safety Information

MSDS Information

Calconcarboxylic acid Usage And Synthesis

Chemical Properties	dark violet powder
Uses	Calconcarboxylic acid is used as an indicator for calcium titrations with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium.
Purification Methods	Purify it via its p-toluidinium salt, viz: dissolve the dye in warm 20% aqueous MeOH, treat with an equivalent of p-toluidine and cool to precipitate the salt. Finally recrystallise the acid from hot water. [Itoh & Ueno Analyst (London) 95 583 1970.] It is an indicator and complexes with Ca2+ in presence of Mg2+ and other metal ions [Patton & Reeder Anal Chem 28 1026 1956, Prentoe & Prentoe Analyst 106 227 1981].

Calconcarboxylic acid Preparation Products And Raw materials

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