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1、原电池反应电动势及其温度系数的测定Experimentforty-twodeterminationofgalvanicpotentialandtemperaturecoefficientofgalvaniccellFirst,thepurposeoftheexperiment1.grasptheprincipleoftheuseofthepotentialdifferencemeterandtheoffsetmethodtodeterminetheelectromotiveforceofthegalvaniccel1.2.determinet
2、heelectromotiveforceofthereactionoftheprimarycellatdifferenttemperaturesandcalculatethethermodynamicfunctionsofthereactionofthecel1.Two、experimentalprinciple1.determinationoftheelectromotiveforceofacellreactionTheelectromotiveforceofgalvaniccellreactionmustbemeasuredbypoten
3、tialdifferencemeteraccordingtotheprincipleofresistaneetoconsumptionprinciple・SeeAppendix4.ofthebookinrelationtotheprincipleRelationshipbetweentemperaturecoefficientandthermodynamicfunctionof2.cellreactionEMFTheelectromotiveforcecoefficientofelectromotiveforcecanbeobtainedby
4、measuringtheelectromotiveforceEofaprimarycellreactionatdifferenttemperatures・TheEfunctionandthefollowingrelationcanbeusedtocalculatethechangeoftheCoriolisfunction,entropyandenthalpychangeofthebatteryreaction:(5-43)(5-44)(5-45)Intheformula,Zisthenumberofchargereaction,Fisthe
5、constant9.6485mana,-Zn
6、ZnC12)forprimarycells(0.Imo1.kg-1),KC1(
7、Hg2C12,Hg+(saturated)anodereactionPositivereactionBatteryreactionObviously,theelectromotiveforceofthebattery(5-46)Theelectricpotentialofthesaturatedcalomelelectrodereactionisknown(seeAppendix4ofthisbook),sothepo
8、tentialofzincelectrodecanbeobtainedbythereactionofthebatteryreactionelectricpotentialmeasuredcalculation.ThreereagentsandinstrumentsReagent:0.100ZnC12solution.Instrument:UJ25typehighpotentialdifferenee,ZII2balanceindicator(morethan2instrumentscanalsobeusedSDCdigitalintegrat
9、edtestinstrumentinsteadofthepotentialdifference,BC9)saturatedstandardcell,glasscylinderthermostat,No.1,saturatedcalomelelectrode・Four,checksteps1.adjustthethermostatto20degreescentigrade・2.calculatetheelectromotiveforceofthestandardcellatroomtemperatureaccordingtotheformula
10、;(5-47)3.,accordingtotheprincipleofconsumerprotectionandtheoperationofhighpotentia
