electrochemical cell electrolytic...
TRANSCRIPT
Chemistry12ElectrochemistryV
Name:Date:Block:
1. Electrolysis2. ElectrolyticCell
ElectrolysisElectrolysis:thetransformationof______________________energyinto______________________energy.
• Usedmainlyinindustryto______________________acompoundintoitselements.• Theelectrodesusedareofteninert(non-reactive)materials–justinvolvedinelectrontransfer
ElectrochemicalCell ElectrolyticCell
• ___________electricity.• Transforms________________energyinto
________________energy.
• ___________electricity.• Transforms________________energyinto
________________energy.
• ___________avoltagesource. • ___________avoltagesource.
• ___________halfcells. • ___________cell.
• ______________________redoxreaction.• Eois________________.
• ______________________redoxreaction.• Eois________________.
• ___________saltbridge • ___________saltbridge.
• Diagram:
• Diagram:
• Oxidationhalfreactionis________________thereductionhalfreactionintheSRPtable.
• Oxidationhalfreactionis________________thereductionhalfreactionintheSRPtable.
• Willusethe_________________OAandthe_________________RA.
• Willusethe_________________OAandthe_________________RA.
• Electronstravelfromthe________________tothe________________.
• Electronstravelfromthe________________tothe________________.
WhatAmI?1. Ihave2halfcells.2. Myoxidationhalf-reactionis:NiàNi2++2e-andmyreductionhalfreactionisFe2++2e-àFe3. Oxidationoccursatmyanode.4. Itransformchemicalenergyintoelectricity5. Inordertoflow,theelectricalchargerequiresacompletepathorcircuit.6. YoucanusetheSRPtabletocalculatehowmuchvoltageis“takes”tooperateme.7. MyEois+0.94V.
ElectrolyticCells
THINGSTOCONSIDER:LiquidContent:
Molten“melted”
Ex.
Aqueous“dissolvedinwater”
Ex.
Electrodes:
Inert“non-reactive”
Ex.
Non-inert“reactive”
Ex.
OverpotentialEffectofWATER:H2Oexhibitsahigherpotentialthanitstruepositiononthetableandthereforeneedstobere-positioned.H2OasaREDUCINGAgentHalfReaction:Eo=H2OasanOXIDIZINGAgentHalfReaction:Eo=
____________________________________________________________________________________________________________________
Example1:Identifythehalf-reactionsoccurringinanelectrolyticcellwithcarbonelectrodesinmoltenMgI2andpredictthevoltagerequiredtooperatethiscell.
o Identifytheoxidizingagentandthereducingagent.
o Writethetwohalf-reactionsandcalculatethevoltagerequired.
o Drawtheelectrolyticcell:Example2:Identifythehalf-reactionsthatoccurintheelectrolysisofanaqueoussolutionofmanganese(II)bromidewithplatinumelectrodesandpredictthevoltagerequiredtooperatethiscell.
o Identifytheoxidizingagentandthereducingagent.
o Writethetwohalf-reactionsandcalculatethevoltagerequired.
o Drawtheelectrolyticcell:
Example3:Identifythehalf-reactionsthatoccurinanelectrolyticcellconsistingofcopperelectrodesinanaqueoussolutionofCrBr3andpredictthevoltagerequiredtooperatethiscell.
o Identifytheoxidizingagentandthereducingagent.
o Writethetwohalf-reactionsandcalculatethevoltagerequired.
o Drawtheelectrolyticcell:Practice:Forthefollowing,identifythetypeofelectrolyticcell,thehalf-reactionsoccurringwithinitandthevoltagerequiredtooperatethecell.
1. PlatinumelectrodesinCaSO4(aq)
2. IronelectrodesinNaCl(aq)
3. CarbonelectrodesinmoltenNiBr2
4. InertelectrodesinCuBr2(aq)
HebdenWorkbook:Pg.242#65-68