analytical lab 5 - Jeff Hunter Section 004 Lab 5 EDTA...

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Jeff HunterSection 004Lab 5. EDTA Titration: Determination of Mg2+Jeff HunterSection 004Lab 5. EDTA Titration: Determination of Mg2+
Jeff HunterSection 004Lab 5. EDTA Titration: Determination of Mg2+Introduction:The goal of this experiment is to determine the amount of Mg2+in a sample using EDTA titration.This technique of titration is known as a complexation reaction, which is defined as the interaction between a ligand and a metal ion. For this experiment the ligand EDTA will act as theLewis base, and the unknown amount of Mg2+will act as the Lewis acid. Critical to the understanding of this process is the idea of chelating ligands and their interactions with pH. Chelation involves the formation of bonds between multiple ligands and a central metal ion1. Due to the nature of metal ions, they can form up to seven bonds at one time, which is required for the titration. In order for this to occur however, a certain pH must be maintained by a buffer to make the environment acceptable for chelation. This occurs at pH 10, and will allow for the reaction to reach its endpoint2. The endpoint will be marked by “Eriochrom Black T,” and it is hypothesized that with proper titration the amount of MgO in the sample can be found. Reactions:MgIn + EDTA -> Mg(EDTA) + InMaterials Used:Analytical balanceBeakerGraduated cylinderIndicatorBuretteVolumetric FlaskExperimental Procedure:Preparation of glassware
Jeff HunterSection 004

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