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HomeProduct name listEriochrome Black T

Eriochrome Black T

Synonym(s):Chrome black T, 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-6-nitronaphthalene-4-sulfonic acid sodium salt;Eriochrome black T (C.I. 14645);Mordant Black 11

  • CAS NO.:1787-61-7
  • Empirical Formula: C20H12N3NaO7S
  • Molecular Weight: 461.38
  • MDL number: MFCD00003935
  • EINECS: 217-250-3
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-12-18 14:15:30
Eriochrome Black T Structural

What is Eriochrome Black T?

Chemical properties

black powder

The Uses of Eriochrome Black T

Eriochrome black T is used as an indicator in analytical chemistry. It is also used in the detection of rare earth metals. It finds application in dyeing and printing of wool fabric, dyeing of silk and nylon as well as in leather dyeing. It can be used in the spectrophotometric determination of diphenhydramine hydrochloride in pharmaceutical preparations. As a complexometric indicator, it is useful in the determination of hardness of water.

The Uses of Eriochrome Black T

To dye wool from an acid bath reddish-black, which can be converted to blue-black by afterchroming. As indicator in the determination of the total calcium and magnesium content of water.

The Uses of Eriochrome Black T

Eriochrome? Black T has been used to determine the concentration of Ca2+ using complexometric titration method.

What are the applications of Application

Mordant black 11 is a dye, potentially useful as a metal indicator, with a Color Index of 14645 and a Dye content of 55%.

Preparation

4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazotization, and Naphthalen-1-ol?coupling.

General Description

Eriochrome? Black T is used as an indicator for complexometric titrations. It functions as an acid-base indicator. Eriochrome? Black T forms complex with Ca2+ and Mg2+, but it binds more strongly to Mg2+ ions.

Purification Methods

The sodium salt (200g) is converted to the free acid by stirring with 500mL of 1.5M HCl, and, after several minutes, the slurry is filtered on a sintered-glass funnel. The process is repeated and the material is air dried after washing with acid. It is then extracted with *benzene for 12hours in a Soxhlet extractor, the *benzene solution is evaporated and the residue is air dried. A further desalting with 1.5M HCl (1L) is followed by crystallisation from dimethylformamide (in which it is very soluble) by forming a saturated solution at the boiling point, and allowing to cool slowly. The crystalline dimethylammonium salt so obtained is washed with *benzene and treated repeatedly with dilute HCl to give the insoluble free acid which, after air drying, is dissolved in alcohol, filtered and evaporated. The final material is air dried, then dried in a vacuum desiccator over Mg(ClO4)2. The purified acid is converted to the dimethylammonium salt with Me2NH. [Diehl & Lindstrom, Anal Chem 31 414 1959]. It is an indicator in the complexometry of alkaline earth metals. [Beilstein 16 IV 429.]

Properties and Applications

blue black. Dark brown powder. Soluble in water for bordeaux red to jam red, moderate soluble in ethanol for brown light magenta, slightly soluble in Acetone. Dye in concentrated sulfuric acid for skipper, dilution to pale red light brown; In concentrated nitric acid to orange. Dye aqueous solution to join concentrated hydrochloric acid for sauce red; Join strong caustic into brown light magenta. Mainly used for all kinds of wool fabric dyeing, also used for silk, nylon and wool and a variety of fiber blended fabric dyeing, can be in chrome pretreatment of wool fabric direct printing. Is tasted can be used for indicator, also can be used for biological and fur dyeing.

Standard Ironing Fastness Light Fastness Fulling Persperation Fastness Soaping Water
Alkali Acid
ISO 4-5 7 5 5 5 5 5
AATCC 4-5 7 4-5 5 5 5

Properties of Eriochrome Black T

Density  1.109 g/mL at 25 °C
Flash point: 185 °C
storage temp.  room temp
solubility  50g/l
form  Powder/Solid
Colour Index  14645
pka pK1:6.3;pK2:11.55 (25°C)
Specific Gravity 1.109
color  Brownish-black to black
Odor Odorless
PH 3.7 (10g/l, H2O, 20℃)
Water Solubility  50 g/L (20 ºC)
Merck  14,3667
BRN  4121162
Stability: Stable. Incompatible with strong oxidizing agents, strong reducing agents.
CAS DataBase Reference 1787-61-7(CAS DataBase Reference)
EPA Substance Registry System C.I. Mordant Black 11, monosodium salt (1787-61-7)

Safety information for Eriochrome Black T

Signal word Danger
Pictogram(s)
ghs
Environment
GHS09
GHS Hazard Statements H411:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes P273:Avoid release to the environment.
P391:Collect spillage. Hazardous to the aquatic environment
P501:Dispose of contents/container to..…

Computed Descriptors for Eriochrome Black T

Eriochrome Black T manufacturer

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