What is the color change of eriochrome black T in EDTA titration?
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.
What is the chemical name of eriochrome black T?
|CAS Number 1787-61-7|
|PubChem CID 5351620|
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 structure of eriochrome black T?
Eriochrome Black T/Formula
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 buffer of pH 10 is added 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.
What is the role of Eriochrome Black T in the EDTA?
Explain the role of Eriochrome Black –T and ammonia buffer in the EDTA titration. (Dec 2011) (April 1995) Eriochrome Black T indicator is blue in colour. When EBT indicator is added to water sample, it forms a wine red coloured unstable Ca-Mg-EBT complex.
What happens when Eriochrome Black T is added to water?
Eriochrome Black T indicator is blue in colour. When EBT indicator is added to water sample, it forms a wine red coloured unstable Ca-Mg-EBT complex. This reaction is carried out under a basic PHof 8- 10 using ammonia buffer. Ca2+2+/ Mg + EBT - [Ca / Mg –EBT] (in water) unstable wine red complex
What does eriochrome black t stand for in chemistry?
Eriochrome is a trademark of Huntsman Petrochemical, LLC. In its deprotonated form, Eriochrome Black T is blue. It turns red when it forms a complex with calcium, magnesium, or other metal ions. EBT is blue in a buffered solution at pH 10.
When does the eriochrome black t turn blue?
In its deprotonated form, Eriochrome Black T is blue. It turns red when it forms a complex with calcium, magnesium, or other metal ions. EBT is blue in a buffered solution at pH 10.