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Lecture 14

CHEM 212 Lecture 14: Oct. 14/2016

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University of Victoria
CHEM 212
Hamilton M.Coreen

find more resources at Chem 212 Lecture 14 Oct. 14/2016 Precipitation Titrations: -not collecting the precipitate -advantage -dont have to take the time to make a really good quality ppt Volumetric Analysis: -volume is the data -Titration= addition of measurments of a reagent solution -Titrant- reagent solution (known conc) -Indicator- observable property (colour) that changes NEAR the equivalence point -NEAR bc how good are these indicators--> picking an indicator that changes colour near pH of your end point -Automated titrater -Equivalance point: when quantity of titrant is added in exact amount needed for stoichiometric rxn with analyte. True end of titration -Endpoint- where indicator changes colour. Titration: -reaction must be fast and complete -2 ways to find endpoint: -Colour indicator -Measure a signal while doing the titration, keep going until signal doesn't change any more then plot signal on y axis vs volume of titrant and find endpoint graphically. 2 Types of methods: -Direct titration- add titrant from buret until run complete -Back titration- add a known amount of reagent to the analyte -let them react -then titrate the leftover of the 1st reagent with a 2nd reagent Amount of analyte= amount of 1st reagent-amount of second reagent -use when reaction is not fast or is not easy to find the end point Precipitation Titration Curve -pX=-logAx=-log[X] -The titrant is X and pX is the amount of X left in solutions-not the total amount of X added as some is used to make the
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