EBT Full Form in Chemistry | EBT Indicator Full Form

 EBT Full Form in Chemistry

The EBT full form in chemistry (EBT indicator full form) is Eriochrome Black T. 

• The EBT is an azo dye and has functional group  R−N=N−R′, in which R and R′ are usually aryl. The EBT indicator structure is shown below. 

Structure of EBT Indicator (Eriochrome Black T)

• It is a complexometric indicator used in complexometric titrations 
• It is known for its chelating properties 
• The Eriochrome is a trademark of am American company Huntsman Petrochemicals, LCC 

Applications of EBT in chemistry

• It is mainly used as an indicator to determine the hardness of the water in the EDTA method
• In complexometric titrations, the compound is used as an indicator, as an acid-base indicator. The indicator forms complex with metals ions like Ca2+, Mg2+ etc
• The indicator is used to determine the concentration of Ca2+ using the complexometric method 

Eriochrome Black T colour change

• The colour of Erichrome Black T is blue in its deprotonated form but when it forms a complex with metal ions like calcium magnesium or other metal ions the colour changes from blue to red. For example, see in the figure below, the EBT is blue in a buffered solution at pH 10 but it turns red when Ca2+ ions are added.

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