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TITRATION METHODS

Amalia Sholehah Jurusan T. Metalurgi FT – UNTIRTA. TITRATION METHODS. Titrations are based on a reaction between analyte and a standard reagent  titrant The rection is of known and reproducible stoichiometry

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TITRATION METHODS

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  1. Amalia Sholehah Jurusan T. Metalurgi FT – UNTIRTA TITRATION METHODS

  2. Titrations are based on a reaction between analyte and a standard reagent  titrant • The rection is of known and reproducible stoichiometry • Titrimetry includes a group of analytical methods that are based on determining the quantity of a reagent of known concentration that is required to react completely with the analyte.

  3. Titrimetric methods : • Gravimetric Titrimetry • Volumetric Titrimetry • Coulometric Titrimetry • Redox Titrimetry • Amperometric Titrimetry • Spectrophotometric Titrimetry

  4. Terms in Volumetric Titrimetry • Standard solution (standard titrant)  a reagent of exactly known concentration that is used in titrimetric analysis • Equivalence point  theoretical point in a titration that is reached when the amount of added titrant is chemically equivalent to the amount of analyte in the sample

  5. End point  the point in a titration when a physical change occurs that is associated with the condition of chemical equivalence • Titration error (Et) Et = Vep - Veq where Vep= actual volume (end point) Veq = theoretical volume (equivalence point)

  6. Primary standard  a high purified compound that serves as a reference material • Primary standard must be : • High purity • Atmospheric stability • Contain no hydrate water • Modest cost • Resonably soluble in titration medium • Have a resonable large molar massa

  7. Secondary standard  a compound whose purity has been established by chemical analysis and serves as reference material for titrimetric method

  8. Ideal standard solution : • Must be sufficiently stable • React rapidly with the analyte • React (more or less) compeletely with the analyte • Undergo a selective reaction with the analyte • Standard solution preparation : • Direct method • Standardization

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