exp.10 沸點上昇法測定分子量
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Exp.10 沸點上昇法測定分子量. 組員 : 汪子晴 49912032_ 目的與原理 陳庭郁 49912030_ 儀器與藥品 , 實驗步驟 林彥汝 49912051_ 數聚處理. 目的. 一、瞭解 Clausius-Clapeyron 方程式 二、熟悉以沸點上昇的方法量測分子量. 原理. 一般非揮發的溶質容於溶劑時，其溶液的蒸氣壓因含有溶質而降低，故其沸點因而升高。假設溶劑沸騰時，其溶質的蒸氣壓可忽略不計，而溶劑的氣象與液相達成平衡 :. 將上式重排，得 Clapeyron equation:. - PowerPoint PPT PresentationTRANSCRIPT
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Exp.10 :49912032_49912030_,49912051_
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Clausius-Clapeyron
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Clapeyron equation:
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Vm(g)Vm(l):Clausius-Clapeyron
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:1.Hvap2.T0PTP0ClausiusClapeyron relation:
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n1:n2:M1:M2:W2:W2:(4)
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Kb(molar boilingpoint constant)KbTb
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n1:n2:M1:M2:W2:W2:(4)(5)(6)
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(Beckmann)100mL
(cyclohexane)______(naphthalene)
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11000.010.001
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_1. 2. S3. 4S4. S[]5. 6. 01
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100ml20(18)0.5g.4.5.
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(g)0.511.5()0.1110.1260.1460.177Tb0.0150.0350.066
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C6H12KbV(mL)D(g/mL)W(g)2.9088251000.77977.9M(g/mol)T0()Hvap(KJ/mol)84.1680.7430.1
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1. Kb
Kb
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2. m
0.5g
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3. M2
M2
0.5g
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(g)0.511.5()0.1110.1260.1460.177Tb0.0150.0350.066m=Tb/Kb0.0051570.012032350.02269M21244.6831066.87145848.6477
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Chart1
1244.683355401
1066.8714474866
848.6477423189
m(mol/kg)
M(g/mol)
M-m
Sheet1
V(mL)D(g/mL)W(g)
2.90882500161000.77977.9
M(g/mol)
84.1680.7430.1
(g)
0.511.5
()0.1110.1260.1460.177
0.0150.0350.066
0.00515672140.01203234980.022689574
1244.6833554011066.8714474866848.6477423189
Sheet1
m(mol/kg)
M(g/mol)
M-m
Sheet2
Sheet3
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http://www.rsc.org/chemistryworld/Issues/2007/December/ClassicKitBeckmannThermometer.asphttp://en.wikipedia.org/wiki/Clausius%E2%80%93Clapeyron_relation