electrochemical cell electrolytic...

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=

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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