Lecture 2192014.pdf

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Department
Chemistry
Course
CHEM 2121
Professor
Nicholas Frost
Semester
Spring

Description
Lecture 2192014Friday February 14 20141220 PMBasic ConceptsManipulate flow of electrons through circuit by measuring voltage and current32Fe e Freductionthat electron must come from somewhere23V V eoxidationR beducing agent gives up electrons gets oxidized reduces something elseOxidizing agent the opposite accepts electrons gets reducedGalvanic CellsCombo of 2 redox rxnsbasis for potentiometryAnode electrode where oxidation occursCathode electrode where reduction occursIn picture cathode surfaceAgCl e Ag Claq reductionss2CdsCd 2eoxidationaqnet rxn want electrons to cancel so multiply AgCl rxn by 222AgClsCdsCdaq2Ags2Claq netPotentiometer measures potential differencesubtracts potential from negative terminal from potential in positive terminalE EE measured voltagecellWhen E 0 electrons flow into negative terminalcellWhen E 0 electrons flow into positive terminalcellUse measur
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