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What is the structure of Eriochrome Black T?

What is the structure of Eriochrome Black T?

C20H12N3O7SNa
Eriochrome Black T/Formula

What is EB t write its structure?

Sodium 1-[1-Hydroxynaphthylazo]-6-nitro-2-naphthol-4-sulfonate. Systematic IUPAC name. Sodium 4-[2-(1-hydroxynaphthalen-2-yl)hydrazin-1-ylidene]-7-nitro-3-oxo-3,4-dihydronaphthalene-1-sulfonate. Other names.

What is mordant Black II?

Alternate Names: Mordant black 11 is also known as Eriochrome Black T. 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%. CAS Number: 1787-61-7.

What is the Iupac name of Eriochrome Black T?

IUPAC Name sodium;(4Z)-4-[(1-hydroxynaphthalen-2-yl)hydrazinylidene]-7-nitro-3-oxonaphthalene-1-sulfonate
InChI Key JHUJLRKQZAPSDP-GXTSIBQPSA-M
CAS Number 1787-61-7
PubChem CID 5351620

Why is pH 10 buffer used in EDTA titration?

pH 10 buffer is used in EDTA titration because in EDTA Y4- is predominant, and we want Y4- to react with the metal ions that are present in the titration solution. This can be achieved by using a pH 10 buffer.

What is the use of eriochrome black T?

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.

What is the colour of EBT indicator?

blue
A blue dye called Eriochrome Black T (ErioT) is used as the indicator. This blue dye also forms a complex with the calcium and magnesium ions, changing colour from blue to pink in the process.

What is pM indicator?

A complexometric indicator is an ionochromic dye that undergoes a definite color change in presence of specific metal ions. Complexometric indicators are also known as pM indicators.

Which indicator is used in complexometric titration?

To carry out metal cation titrations using EDTA, it is almost always necessary to use a complexometric indicator to determine when the end point has been reached. Common indicators are organic dyes such as Fast Sulphon Black, Eriochrome Black T, Eriochrome Red B, Patton Reeder, or Murexide.

What color is EDTA?

EDTA is short for ethylenediaminetetraacetic acid. A blue dye called Eriochrome Black T (ErioT) is used as the indicator. This blue dye also forms a complex with the calcium and magnesium ions, changing colour from blue to pink in the process. The dye–metal ion complex is less stable than the EDTA–metal ion complex.

Why is pH 10 maintained in complexometric titration?

EDTA is insoluble in water at low pH because H4Y is predominant in that pH (less than 2). With increasing the pH, each hydrogen ion in the carboxyl groups of EDTA will start to dissociate. As we need Y4- to react with the metal ions present in the titration solution, we use pH 10 buffer such as ammonium chloride.

Why do we add buffer solution in EDTA titration?

A buffer solution is used in EDTA titration because it resists the change in pH. This is because all the reactions between the metal ions and EDTA are pH-dependent.

What kind of dye is Eriochrome Black T?

Eriochrome Black T is a complexometric indicator that is used in complexometric titration s, e.g. in the water hardness determination process. It is an azo dye. Eriochrome is a trademark of Huntsman Petrochemical, LLC .

What is the CAS number for solochrome black T?

Sodium 4- [2- (1-hydroxynaphthalen-2-yl)hydrazin-1-ylidene]-7-nitro-3-oxonaphthalene-1-sulfonate; Solochrome Black T; ET-00; Erio T. Identifiers. CAS Number. 1787-61-7. Y. 3D model ( JSmol) Interactive image. Abbreviations. EBT.

When to use Eriochrome Black T in EDTA titration?

Applications. When used as an indicator in an EDTA titration, the characteristic blue end-point is reached when sufficient EDTA is added and the metal ions bound to the indicator are chelated by EDTA, leaving the free indicator molecule. Eriochrome Black T has also been used to detect the presence of rare earth metals.

How is Eriochrome Black T harmful to aquatic life?

H411 (30.61%): Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard] H412 (44.9%): Harmful to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]