最大气泡法测表面张力实验数据及处理

五、实验数据记录与处理室温：24.3cC人气压：100.73Pa1、乙醇水溶液的折光率利用文献数据作n~c工作曲线，依据实验测定数据，计算样品的浓度 a（1）将25「C时乙醇•水溶液的浓度与折光率关系衣（农一），绘制成溶液浓度与折光率的工作曲线（图一）。25C恒温水浴下测得水的折射率为： 1.3322/1.3323/1.3323求得平均值为：1.332266667利用水的折射率校正：c/(mol/L)00.911.702.623.554.105.218.5812.0013.5917.17n1.33251.33581.3381.3411.3441.34621.34921.35781.36211.36391.3696校正后n1.33231.33561.33781.34081.34381.34601.34901.35761.36191.36371.3694农•251时乙醇•水溶液的浓度与折光率关系衣1.370■■•(c,n)1.365n〜c拟合直线a/■1.360•/1.3551.350•1.345■Equation y=a+baxWeight NoWeighting•ResidualSum 4.1E・51.340ofSquares•Pearsonsr 0.98459■Adi.R-Sauare 0.966011.335■ValueStandardErrornIntercept11.3352710.001061.330-2 0 2 46 8 10 12 14 16 18c/(mol/L)图•溶液浓度与折光率的工作曲线（2）实验配制的乙醇溶液折光率数据如 农二所示。乙醇溶液5%10%15%20%25%30%35%40%

乙醇质量/g2.505.007.5010.0012.5015.0017.5020.00水的质量/g47.5045.0042.5040.0037.5035.0032.5030.00乙醇称重/g2.53505.06307.629010.148012.798015.729017.591520.1945水称重/g47.976044.982242.883340.921137.486135.425732.565830.0288折11.33551.33861.34201.34551.34881.35161.35381.3555光21.33561.33861.34211.34551.34901.35161.35401.3558率31.33551.33881.34221.34551.34881.35181.35411.3559平均1.33551.33871.34211.34551.34891.35171.35401.3557衣二乙醇的折光率（3）将校正后的乙醇的折光率代入拟合直线方程中，得到各乙醇溶液的真实浓度。如 表三乙醇浓度1U%-20%40%折光率n1.33551.33871.34211.34551.34891.35171.35401.3557校正后n1.33531.33841.34191.34531.34861.35141.35371.3555浓度c(mol/L)0.01201.46703.06134.64016.20357.50378.57179.3921衣三乙醇浴液的浓度待测液体的表而张力八為餌用（mmhhO）zTmax.rJmmH2O)r/(N/m)蒸饰水160.661.460.860.91117.197E-02260.561.360.8360.661.360.9乙醇5%54.754.754.354.56676.447E-0210%40.340.340.540.36674.770E-0215%34.934.935.134.96674.132E-0220%31.331.331.331.30003.698L-0225%29.229.229.20003.450E-0226.526.5-26.526t50003.131E-02-35%26.126.226.126.13333.088E-0224^2475UUU4U%衣四待测样品的农面张力测定将实验测得的水和乙醇溶液的最人 /Pmax值代入公式:7测二（△Pmax・了水）//IPmax・水（查阅附农，得7t=0-07197N/m）求得各乙醇溶液的表面张力如表四所示。2475 247b作广c曲线，求出各浓度下的斜率。FL作一广匚拟合ilMfco I1衷丑所平，拟哈直牛处-圏二计 ~c~0.01201.46703.06T3件・O件UI11y.xjyzi农五门c的相关数据c(mol/L)图二广c拟合曲线（2）用origin作出广c拟合曲线的斜率曲线，如图三所示。-0.020 5DerivativeX110图三广c拟合曲线的斜率曲线（3）将各乙醇溶液浓度代入斜率曲线，求出待测样品的c/mol/L0.012031.467023.061314.640136.203477.503678.571699.39206斜率-0.0212-0.0065-0.0033-0.0022-0.0016-0.0013-0.0011-0.00091表六待测样品的(?7/?CT)P数据4、利用吉布斯吸附等温方程式，计算出各溶液的 roGibbs公式：1.347-0.001261.341-0.001064.2-9.07E-041.347-0.001261.341-0.001064.2-9.07E-04衣七待测样品的『及C/「数据3.814I6E-061967316.7463.66545E-062338508.5853.43495E-062734265.0815＞做c/厂~cI冬,求岀直线斜率,由斜率求岀『直线如图三所示。 RT 其中，R=8.314J/(mol*K),T二25.0+273.15二298.15K将农六中数据代入公式,求出各溶液的 『如*?七所示。C斜率rc/r1.372-0.021221.02983E-07116815.22621.367-0.006543.87052E-06379024.32721.362-0.003334.11251E-06744390.12011.356-0.002184.08077E-061137072.9821.352-0.001553.87902E-061599238.12963.0x101.336X1062.0x10(c,c/iyc/Fc拟合直线61.5x10r1.0x105.0x10Equabon-a*b1.336X1062.0x10(c,c/iyc/Fc拟合直线61.5x10r1.0x105.0x10Equabon-a*bwxWeightWeightingHesidualSu*n6.2061E11ofSquares0.0Pearson'sr0.99361Adj.R-Square0.91612ValueStandardErrorc/rIntercept348768.998C696418.87967c/