Copper Lab Reactions.ppt

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1、CopperLabReactionsUsingObservationalCluesToPredictProductsStep1aCopperturnsblackwhenheatedstronglyinair.Cu(s)+O2(g)→CuO(s)blackRedox(oxidation)Step1bAddingdiluteH2SO4solutiontotheblackproductdissolvestheblackproductoffthesurfaceoftheCu,leavingbehindther

2、eddishCuwestartedwith.Thesolutioncontainingthedissolvedproductisclearblue.CuO(s)+H2SO4(aq)→CuSO4(aq)+H2O(l)blueDoubleDisplacement(acid-base)Step1cWhenNaOHsolutionisaddedtotheCuSO4solutionfrom1b,abluegelprecipitateforms.CuSO4(aq)+NaOH(aq)→Cu(OH)2(s)+Na2S

3、O4(aq)bluegelpptDoubledisplacement(precipitation)Step1dWhenH2SO4solutionisaddedtothebluegel,thegeldissolvesandwegetbackabluesolution.Cu(OH)2(s)+H2SO4(aq)→CuSO4(aq)+H2O(l)bluesolnDoubleDisplacement(acid-base)Step1eWhenthebluegelisheated,wegetasolidblackp

4、roduct.Cu(OH)2(s)→CuO(s)+H2O(l)bluegelblacksolidRedox--decompositionStep2aWhenblueCuSO4•5H2Ocrystalsareheated,theyturnwhite.Clearwhiteliquiddropletsformatthetopofthetube.CuSO4•5H2O(s)→CuSO4(s)+5H2O(l)bluecrystalswhitepowder(notareactiontypethatwe’vestud

5、ied.Notredox/decomposition,sinceelectronsaren’ttransferredbetweenatoms)Step2bWhenwaterisaddedtothewhitepowderfrom1b,wegetbackthebluecrystalswestartedwith.Additionofevenmorewatergivesusourfamiliarbluesolution.CuSO4(s)+5H2O(l)→CuSO4•5H2O(s)CuSO4•5H2O(s)+H

6、2O(l)→CuSO4(aq)(again,notreactionswe’reinterestedinidentifying)Step3WhenanironnailisaddedtotheCuSO4(aq)wemadein2b,thenailturnsreddishincolorandthebluecolorinthesolutionfades.CuSO4(aq)+Fe(s)→Cu(s)+FeSO4(aq)bluesolnreddishRedox–singledisplacementStep4When

7、sulfuricacidsolutionisaddedtogreencopper(II)powder,wegetagasthatturnslimewatercloudyandwegetbackourfamiliarbluesolution.CuCO3(s)+H2SO4(aq)→CO2(g)+CuSO4(aq)+H2O(l)greenpwdrbluesolnDouble-Displacement-acid-base!!!Step4bWhenthegreencoppercarbonatepowderis

8、heated,agasisgivenoffthatturnslimewatercloudy,andablacksolidisleftinthetesttube.CuCO3(s)→CuO(s)+CO2(g)greenpwdrblacksolidRedox-decompositionStep4cWhencharcoalisaddedtotheblacksolidfrom4bandthemixtureisheated,agasisgivenoffthattur