CALMAGITE

Synonym(s):1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid;3-Hydroxy-4-(2-hydroxy-5-methylphenylazo)naphthalene-1-sulfonic acid

CAS NO.：3147-14-6
Empirical Formula: C17H14N2O5S
Molecular Weight: 358.37
MDL number: MFCD00011656
EINECS: 221-563-0
SAFETY DATA SHEET (SDS)
Update Date: 2026-01-13 11:18:58

What is CALMAGITE?

Chemical properties

dark brown crystalline powder

The Uses of CALMAGITE

Calmagite is widely used in analytical chemistry as an indicator in the titration of calcium or magnesium with ethylenediaminetetraacetic acid (EDTA). It is also useful in the determination of magnesium in biological materials.

The Uses of CALMAGITE

As indicator in titration of Ca or Mg with EDTA.

The Uses of CALMAGITE

Used for the determination of magnesium in biological materials.

What are the applications of Application

Calmagite is a complexometric indicator used in analytical chemistry

Purification Methods

A crude dye is extracted with anhydrous diethyl ether and forms red crystals from Me2CO. It gives a red colour in H2O at pH 7—9 and a blue colour at pH 9—11 which turns red on addition of Ca2+ or Mg2+ ions. [Lindstrom & Diehl Anal Chem 32 1123 1960]. Complexes with Ca, Mg and Th.

Properties of CALMAGITE

Melting point:	330 °C (lit.)
Density	0.989
storage temp.	Store at RT.
solubility	Solubility Soluble in water, ethanol
pka	8.1(at 25℃)
form	Powder
color	Purple
Odor	Phenolic odor
PH Range	Red (7.1) to blue (9.1)
Water Solubility	Soluble in water.
λmax	610nm
Merck	14,1718
BRN	708596
Stability:	Stable. Incompatible with strong oxidizing agents.
Major Application	Nanoparticles, cleaning microelectronic substrates, sensors, photographic materials, recording materials, water hardness measurement, indicator for calcium and magnesium, determination of vanadium, medical component, measuring magnesium in biological fluids, diagnosis of diseases caused by elemental imbalance, treatment of thrombocytopenia, Kurine analysis test strip
EPA Substance Registry System	1-Naphthalenesulfonic acid, 3-hydroxy-4-[(2-hydroxy-5-methylphenyl)azo]- (3147-14-6)

Safety information for CALMAGITE

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.