凝固点降低法测定摩尔质量实验装置的改进和应用

黄钟明, 梁沁睿, 黄宛鸿, 荣勤丰, 董家新

Improvement and Application of the Device for Determination of Molar Mass by Freezing Point Depression

Zhongming Huang, Qinrui Liang, Wanhong Huang, Qinfeng Rong, Jiaxin Dong

表3 三种仪器测量尿素、蔗糖和萘的摩尔质量结果

仪器 WA /g WB /g ∆Tf /K M /(g∙mol−1) M理论/(g∙mol−1) 相对误差/% 尿素 仪器A 100.60 1.6028 0.449 ± 0.029 66.5 ± 4.3 60.06 10.7 仪器B 103.75 2.2205 0.617 ± 0.017 64.3 ± 1.8 60.06 7.06 改进仪器 201.06 3.2092 0.492 ± 0.002 60.1 ± 0.2 60.06 0.07 蔗糖 仪器A 100.48 9.2364 0.454 ± 0.020 375 ± 17 342.30 9.55 仪器B 104.00 8.2495 0.445 ± 0.053 330 ± 39 342.30 −3.59 改进仪器 202.04 18.5200 0.478 ± 0.002 355 ± 1 342.30 3.71 萘 仪器A 100.40 0.3072 0.604 ± 0.007 102 ± 1 128.17 −20.4 仪器B 101.10 0.3210 0.618 ± 0.050 104 ± 8 128.17 −18.9 改进仪器 200.08 0.6412 0.517 ± 0.002 125 ± 1 128.17 −2.47