項目八：常規(guī)物理常數(shù)與性能分析任務(wù)三：沸點(diǎn)和沸程的測定乙醇沸點(diǎn)的測定課程：工業(yè)分析中文Scenario8:PhysicalconstantsandperformancetestingTask3DeterminationofboilingpointandboilingrangeDeterminationofboilingpointofethanolCourse:IndustrialAnalysisEglish一、標(biāo)準(zhǔn)方法測定乙醇沸點(diǎn)1-燒瓶，2-試管，3、4膠塞，5-主溫度計，6-輔助溫度計，7-側(cè)孔，8-溫度計1、搭建實(shí)驗(yàn)裝置載熱體為甘油，加入量為燒瓶體積一半試管內(nèi)液面低于加熱體液面主溫度計在被測液體上20mm中文一、Standardmethodfordeterminingtheboilingpointofethanol1、ConstructionofexperimentalequipmentTheheatcarrierisglycerol,andtheamountaddedishalfofthevolumeoftheflaskTheliquidlevelinthetesttubeislowerthantheliquidleveloftheheatcarrierThemainthermometeris20mmabovethemeasuredliquidDevicediagramformeasuringboilingpointusingstandardmethods1-flask;2-testtube;3,4-rubberplugs;5-mainthermometer;6-auxiliarythermometer;7-sidehole;8-ThermometerEglish2、實(shí)驗(yàn)步驟

緩慢加熱，當(dāng)溫度上升到某一數(shù)值并在相當(dāng)時間內(nèi)保持不變時，記錄此時的溫度計讀數(shù)，此溫度即為試樣的沸點(diǎn)。同時記錄輔助溫度計讀數(shù)。記錄室溫及大氣壓。中文2、ProcedureSlowlyheatup,andwhenthetemperaturerisestoacertainvalueandremainsconstantforaconsiderableperiodoftime,recordthethermometerreadingatthistime,whichistheboilingpointofthesample.Simultaneouslyrecordtheauxiliarythermometerreading.Recordroomtemperatureandatmosphericpressure.Eglish3、結(jié)果計算T1：試樣沸點(diǎn)（沸程）的測定值；ΔT1：溫度計示值校正值；ΔT2：溫度計水銀柱外露段校正值；ΔTp：沸點(diǎn)（沸程）隨氣壓的變化值。中文3、ResultcalculationT1：Determinationvalueofboilingpoint(boilingrange)ofthesample；ΔT1：Thermometerreadingcorrectionvalue；ΔT2：Correctionvalueofexposedsectionofmercurycolumninthermometer；ΔTp：Thechangeinboilingpoint(boilingrange)withpressure.Eglish氣壓對沸點(diǎn)（沸程）的校正：

ΔTp：沸點(diǎn)（沸程）隨氣壓的變化值；Cv：沸點(diǎn)（沸程）隨氣壓的校正值（查表獲得）；

p：經(jīng)校正的氣壓值。pt：室溫時的氣壓，×100pa；Δp1：氣壓計讀數(shù)校正值（查表獲得），×100pa；Δp2：緯度校正值（查表獲得），×100pa。中文Theeffectofairpressureonboilingpoint(boilingrange):

ΔTp：Thechangeinboilingpoint(boilingrange)withpressure;Cv：Thecorrectionvalueofboilingpoint(boilingrange)withairpressure(obtainedbylooking

upthetable);

p：Correctedairpressurevalue.pt：Airpressureatroomtemperature,×100pa;Δp1：Barometerreadingcorrectionvalue(obtainedbylookingupthetable),×100pa;Δp2：Latitudecorrectionvalue(obtainedfromtable),×100pa.Eglish溫度計水銀柱外露段的校正：T2：輔助溫度計讀數(shù)h：內(nèi)標(biāo)式水銀溫度計外露段的高度，以溫度值為單位中文Correctionofexposedsectionofmercurycolumninthermometer:T2：Auxiliarythermometerreading;h：Theheightoftheexposedsectionofaninternalstandardmercurythermometer,measuredintemperaturevaluesEglish二、毛細(xì)管法測定乙醇沸點(diǎn)內(nèi)管，內(nèi)徑1mm外管，內(nèi)徑3-4mm數(shù)據(jù)處理同標(biāo)準(zhǔn)法裝樣倒扣內(nèi)管固定外管固定溫度計加熱到連串氣泡從內(nèi)管逸出觀察記錄最后一個氣泡剛要縮進(jìn)內(nèi)管時的溫度制備內(nèi)管中文二、CapillarytubemethodfordeterminingtheboilingpointofethanolInnertube,innerdiameter1mmOutertube,innerdiameter3-4mmDataprocessingisthesameasthestandardmethodLoadsamplesandinnertubesFixedoutertubeFixedthermometerHeatuntilaseriesofbubblesscape