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potentiometry

potentiometry. Physicochemical method that measure certain electron property of substances which is proportional to its concentration. In analysis we have electrochemical method. Ex. Potentiometry Polarography Electrophoresis Conductometry.

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potentiometry

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  1. potentiometry

  2. Physicochemical method that measure certain electron property of substances which is proportional to its concentration In analysis we have electrochemical method Ex. PotentiometryPolarography Electrophoresis Conductometry

  3. Potentiometrictitration * It measure the charge of potential. * Is made by titration. Used for *acid-base ,redox , complex ,precipitation titration. *Very dilute solution. *Colored and turbid solution. *In case of no suitable indicator is available.

  4. instrument pH meter : * referance electrode. * indicator electrode. * Potentiometer meter. * magnet. referance electrode: Is electrode with a constant potential . Ex. normal electrode.(SHE) calomel electrode. Ag/Agcl

  5. :Indicator electrode The potential of this electrode will change due to any change in potential of solution as a result of change in concentration of substance. Ex. * ion selected electrode. glass electrode

  6. Glass combined electrode reference electrode internal reference electrode Ag/Agcl salt bridge PH sensitive glass ( full of buffer )

  7. objectives • Titration of a weak acid ( acetic acid ) against • a strong base ( NaOH)

  8. Potentiometric titration curve of 0.1 n NaOH against ? N acetic acid pH PH at alkaline solution PH at e.p PH at acidic solution mls at e.p mls

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