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机构地区:[1]山东警察学院,山东济南250014 [2]江苏工业学院,江苏常州213016
出 处:《化学世界》2009年第5期268-270,共3页Chemical World
摘 要:两种4-羟基吡啶(HP)的盐酸盐:HP.HCl(A)和(HP)2.HCl.H2O(B)具有不同的晶体结构,但在水溶液中它们应该是同样的HP共轭酸碱体系。为了得到HP合成工艺中需要的等电点(I)和离解常数Ka1两项参数和有必要证明在水溶液中(A)和(B)是同样的共轭酸碱体系,用pH计测定的酸碱滴定法,测定了HP的等电点(I)和离解常数Ka1,证明(A)和(B)是同样的共轭酸碱体系,并对上述参数进行了不确定度评定。Two 4-hydroxy-pyridine (HP) hydrochloric acid salts, HP · HCl (A) and (HP)2 · HCl · H2O (B) are different in crystalline structure, but should be the same conjugate acid-base system of HP in aqueous solution. In the interest of obtaining the technical parameters of HP, the isoelectric point (I) and dissociation constant K,a and proving the same conjugate acid-base system of HP in aqueous solution of (A) and (B), I and Kal were determined by acid-base titration with pH meter. The evaluation of uncertainty of these physical-chemical constants was carried out. The same conjugate acid-base system of HP in aqueous solution of (A) and (B) was also proven.
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