CAS 1787-61-7: Eriochrome Black T

Description:Eriochrome Black T, with the CAS number 1787-61-7, is a synthetic organic compound commonly used as a pH indicator and a complexometric indicator in titrations, particularly for determining metal ions such as calcium and magnesium. It appears as a dark blue or violet powder and is soluble in water, forming a red solution at acidic pH levels. The compound is characterized by its ability to form stable complexes with metal ions, which is crucial for its application in analytical chemistry. Eriochrome Black T has a molecular formula of C20H12N3NaO7S and features a sulfonic acid group that enhances its solubility in aqueous solutions. Its color change from blue to red as the pH shifts from alkaline to acidic makes it a valuable tool in various titrimetric analyses. However, it is important to handle this compound with care, as it may pose health risks if ingested or inhaled, and appropriate safety measures should be taken during its use in laboratory settings.

Formula:C₂₀H₁₃N₃O₇S·Na

InChI:InChI=1S/C20H13N3O7S.Na/c24-17-10-18(31(28,29)30)15-9-12(23(26)27)6-7-14(15)19(17)22-21-16-8-5-11-3-1-2-4-13(11)20(16)25;/h1-10,24-25H,(H,28,29,30);

InChI key:InChIKey=YUJFCGQWGATJPG-UHFFFAOYSA-N

SMILES:[Na].O=N(=O)C1=CC=C2C(N=NC=3C=CC=4C=CC=CC4C3O)=C(O)C=C(C2=C1)S(=O)(=O)O

Synonyms:
Erichrome Black T
sodium 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitro-naphthalene-1-sulfonate
Chromogene Black ET
Eriochrome Balck T
C.I. Mordant Black 11, monosodium salt (8CI)
Mordant black 11
Eriochrome Black T
Eriochrome (R) black T
3-Hydroxy-4-(1-hydroxy-2-naphthylazo)-7-nitro-1-naphthalenesulfonic acid, sodium salt
2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-6-nitro-4-naphthalenesulfonic acid, sodium salt
See more synonyms
C.I. Mordant Black 11, monosodium salt
C.I.Mordant Black 11
C.I. 14645
C.I. Mordant Black 11 (VAN)
1-Naphthalenesulfonic acid, 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitro-, monosodium salt
sodium (4Z)-4-[(1-hydroxynaphthalen-2-yl)hydrazono]-7-nitro-3-oxo-3,4-dihydronaphthalene-1-sulfonate
1-Naphthalenesulfonic acid, 3-hydroxy-4-[2-(1-hydroxy-2-naphthalenyl)diazenyl]-7-nitro-, sodium salt (1:1)
Eriochrome Balck T250
C.I. Mordant Black 11, monosodium salt
Eriochrome black T supra
Color index
1-Naphthalenesulfonic acid, 3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-7-nitro-, monosodium salt
sodium 3-hydroxy-4-[(E)-(1-hydroxynaphthalen-2-yl)diazenyl]-7-nitronaphthalene-1-sulfonate
Mordant Black 11 (14650)

Found 15 products.

Product data	Purity	Price range	Estimated delivery
Eriochrome Black T (1:100 diluted with NaCl) REF: 3B-E0487CAS: 1787-61-7	- - -	23.00 €	Fri 25 Apr 25
Eriochrome Black T REF: 3B-E0214CAS: 1787-61-7	- - -	58.00 €	Fri 25 Apr 25
Eriochrome Black T REF: 02-A17536CAS: 1787-61-7	- - -	39.00 €~128.00 €	Mon 28 Apr 25
1-Naphthalenesulfonic acid,3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-7-nitro-, monosodium salt REF: IN-DA00HZWDCAS: 1787-61-7	- - -	25.00 €~106.00 €	Fri 02 May 25
Eriochrome Black T REF: 54-OR1013110CAS: 1787-61-7	- - -	32.00 €~2,538.00 €	Mon 05 May 25
Eriochrome Black T (C.I. 14645) REF: 7W-GT2024CAS: 1787-61-7	95 - 105 %	23.00 €~109.00 €	Mon 05 May 25
Eriochrome Black T (C.I. 14645); ACS grade REF: 7W-GT1416CAS: 1787-61-7	- - -	50.00 €~311.00 €	Mon 05 May 25
Eriochrome™Black T, ACS reagent, indicator grade REF: AC-43914CAS: 1787-61-7	- - -	78.00 €~196.00 €	Mon 05 May 25
Eriochrome black T indicator (C.I. 14645), 1% solid REF: 10-F987448CAS: 1787-61-7	- - -	25.00 €~80.00 €	Mon 05 May 25
Eriochrome™ Black T, pure, indicator grade REF: AC-22836CAS: 1787-61-7	- - -	To inquire	Mon 05 May 25
Mordant Black 11 (Technical Grade) REF: TR-M635003CAS: 1787-61-7	- - -	97.00 €	Mon 12 May 25
Eriochrome black t REF: 10-F047074CAS: 1787-61-7	- - -	To inquire	Mon 12 May 25
Eriochrome Black T extrapure AR REF: SR-40876CAS: 1787-61-7	- - -	23.00 €~54.00 €	Fri 30 May 25
Eriochrome Black T REF: TM-T19901CAS: 1787-61-7	- - -	1,444.00 €~2,375.00 €	Tue 10 Jun 25
Mordant black 11 - Technical REF: 3D-FM32792CAS: 1787-61-7	Min. 95%	To inquire	Fri 13 Jun 25