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What are the main types of EDTA titrations?
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Complexometric titrations are used to determine the concentration of metal ions in a solution. EDTA is a common chelating agent used in these titrations. The main types of EDTA titrations are:
1. Direct Titration: In this method, the metal ion is titrated directly with EDTA using an indicator. The indicator changes color when the metal ion is completely complexed with EDTA.
2. Back Titration: In this method, an excess of EDTA is added to the metal ion solution. The excess EDTA is then titrated with a standard solution of a metal ion using an indicator.
3. Indirect Titration: In this method, the metal ion is precipitated with a known excess of a precipitating agent. The precipitate is then dissolved and the excess precipitating agent is titrated with EDTA using an indicator.
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