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Chemistry · L4 · EDTA Complexometric Titration · flowchart

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by @openstemUpdated Chemistry
Sample + Eriochrome Black T (EBT)metal ion loosely bound to EBTsolution is wine-redStandardized EDTA solutionadded dropwise from buretteEDTA reacts first with anystill-free metal ion in solutionFree metal ion exhausted:EDTA now competes with EBTfor the metal ion EBT is holdingEDTA wins the competitionKf(metal-EDTA) >> Kf(metal-EBT)Metal ion transfers fromEBT to EDTA, forming M-EDTAEndpoint: EBT is released freesolution turns BLUE

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