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Eriochrome Black T 25gm Indicator
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Eriochrome Black T 25gm Indicator

Original price was: 1,300.00৳ .Current price is: 1,150.00৳ .

Eriochrome Black T, typically supplied in a 25gm quantity, is a vital complexometric indicator widely employed in analytical chemistry, particularly for determining water hardness due to the presence of calcium and magnesium ions. This azo dye changes color based on the presence of metal ions and the pH of the solution. In a buffered solution around pH 10, the free indicator appears blue. However, upon binding with metal ions like calcium or magnesium, it turns a distinct wine red. During EDTA titrations, when EDTA chelates the metal ions, the Eriochrome Black T is released, causing the solution to revert to its characteristic blue color, signaling the titration’s endpoint.

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Description

Eriochrome Black T is a chemical compound commonly used as an indicator in complexometric titrations, particularly for the determination of calcium and magnesium ions in water.

  1. Chemical Formula: C20H12N3NaO7S
  2. Appearance: It typically comes in a dark blue powder or a solid form.
  3. Usage: It is used primarily in water testing and analytical chemistry for titrating metal ions, often in conjunction with EDTA (ethylenediaminetetraacetic acid).

Applications of Eriochrome Black T:

  1. Complexometric Titration: It helps in determining the concentration of metal ions by changing color at the endpoint of the titration. For example, it turns from blue to red as the metal ions are complexed with EDTA.
  2. Water Quality Testing: It is used to measure hardness in water, which is caused by calcium and magnesium ions.

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