Titrations Standard reagent is added to a solution containing analyte until the reaction between the analyte and the reagent is judged to be complete.

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Presentation transcript:

Titrations Standard reagent is added to a solution containing analyte until the reaction between the analyte and the reagent is judged to be complete

Types of Titrations Volumetric: standard reagent is measured volumetrically Gravimetric: mass of standard reagent is measured Coloumetric: Quantity of charge in coloumbs to complete a reaction is measured

Endpoint detection: example of NaOH + HCl Phenophalein Indicator error

Methods of endpoint detection 1. Color change 2. Voltmeters including pH meters 3. Refractometers 4. turbidometers 5. even thermometers Goal in a titration is to determine the amount of analyte

Redox titration example How many grams of oxalic acid should be dissolved in 500.0mL of water to make a 0.100N solution for titration with MnO4-?

Coloumetric Titration Cyclohexene is titrated with Br2 that has been electrolytically oxidized from Br-. If it requires 595.1 sec to complete the titration with a current of 4.825mA, how much cyclohexene was there in the sample?