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	邻、间、对位-二甲苯在盐的水溶液中活度系数的研究; STUDIES ON ACTIVITY COEFFICIENTS OF o, m, p-XYLENE IN AQUEOUS SALT SOLUTIONS
	姬泓巍 ; 谢文蕙
	1987
关键词	盐析常数 活度系数 盐效应 偶极矩 色散力 黄子卿 种盐 紫外分光光度计 摩尔体积 NaBr
英文摘要	本文用紫外分光光度计测定了25℃下邻、间、对位三种二甲苯在八种盐水溶液中的活度系数f和盐析常数k值。所用的盐为LiCl、NaCl、KCl、SrCl2、BaCl2、LiBr、NaBr、KBr。将三种二甲苯的lgf分别对八种盐的浓度Cs作图,得到二十四条通过原点的直线,符合Setschenow盐析经验公式。三种二甲苯的盐析次序均为BaCl2>SrCl_2>NaCl>KCl>NaBr≈LiCl>KBr>LiBr.实验表明:每种盐的盐效应是单个离子的贡献之和;随着二甲苯偶极矩的增大,盐析常数有下降的趋势。本文计算了四种理论的盐析常数k_s值。对内压力理论改进公式提出了一些假设,选用了Latimer离子...; The solution of o, m, p-xylene in water as well as in the aqueous salt solution was determined at 23 degrees C by spectrophotometer. The activity coefficient (f) of each of the xylenes has also been calculated. The salts used are LiCl, NaCl, KCl, SrCl2, BaCl2, LiBr, NaBr and KBr. The salt concentrations (c(2)) used are 0-1 mol L-1. When longf were ploted vs. c(2) for eight salts, the obtained results are all straight lines. On comparison of the slopes of these 24 lines, the salting-out order is BaCl2>SrCl2>NaCl>KCl>NaBr approximate to LiCl>KBr>LiBr for each of the xylenes. The salt effect constant k(s) can be expressed in terms of the sum of k. and k(=1) . The value of k(s) decreases with the increase of the dipole moment of the xylene molecule. The salting-out constants of these xylenes in eight aqueous salt solutions have been calculated respectively by the formulas of (1) Debye-McAulay, (2) Conway-Desnoyers-Smith, (3) McDevit-Long and (4) modified internal pressure theory. Some assumptions were made for the modified equation of the internal pressure theory. When the distance between ion and nonelectrolysis molecule in acqueous salt solution was calculated, Latimer's radii are used instead of the Pauling's radii of ions. For larger nonelectrolyte molecules, equation of the modified internal pressure theory (i) give results in better agreement with the experiment than those of (1), (2) and (3).; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000207569200008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 3; 02; 146-154; 3
语种	中文
出处	SCI ; 知网
出版者	物理化学学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/78668]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	姬泓巍,谢文蕙. 邻、间、对位-二甲苯在盐的水溶液中活度系数的研究, STUDIES ON ACTIVITY COEFFICIENTS OF o, m, p-XYLENE IN AQUEOUS SALT SOLUTIONS. 1987-01-01.

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