Amalia sholehah jurusan t metalurgi ft untirta
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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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Amalia sholehah jurusan t metalurgi ft untirta

Amalia Sholehah

Jurusan T. Metalurgi

FT – UNTIRTA

TITRATION METHODS


Titration methods

  • 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.


Titration methods

  • Titrimetric methods :

    • Gravimetric Titrimetry

    • Volumetric Titrimetry

    • Coulometric Titrimetry

    • Redox Titrimetry

    • Amperometric Titrimetry

    • Spectrophotometric Titrimetry


Terms in volumetric titrimetry

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


Titration methods

  • 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)


Titration methods

  • 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


Titration methods

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


Titration methods

  • 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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