EBT is Eriochrome Black-T.It is used in complexometric titrations.Its structural formula is HOC10H6N=NC10H4(OH)(NO2)SO3Na.
HOC10H6N=NC10H4(OH)(NO2)SO3Na (Eriochrome Black T is an indicator chemical.)
If for you EBT is eriochrome black T, this compound form a complex with magnesium ions.
Erio Chrome Black-T, is usually used as indicator. It is commonly known as EBT. EBT can easily form weak complex ,which can be replaced easily by Sequencing agent Ethylene Diammine Tetra Acetic acid
EBT is also known as Erichrome Black T and is useful in titrations with EDTA where it starts as a dark/wine red colour and changes to a deep blue in titrimetric analysis.
ebt is used to get the end point of reaction that is in the end point it gives steel blue colour describing that the reaction completed now
because EBT work best in that pH