摘要
应用电动势法在278.15～318.15K温度范围内测定了无液接电池(A)的电动势: Pt,H2(101.325kPa)|HCl(m1),MgSO4(m2),尿素(10%)-H2O|AgCl-Ag(A)根据测得的电池(A)的电动势,确定了混合溶剂中硫酸镁离子对的缔合常数K。通过K值首先讨论了温度对硫酸镁缔合常数的影响,结果表明符合Hamed-Robinson经验方程:pK=A1/T+A2+A3T。其次,讨论了溶剂介电常数D对K的影响,得出经验方程:pK=g+h/D。
The emfs of cell (A) without liquid junction were determined at 278.15~318.15 K: Pt,H_2(101.325 kPa)|HCl(m_1),MgSO_4(m_2),尿素(10%)-H_2O|AgCl-Ag(A) In term of the emfs data of cell (A), the association constant K of the ion pair of magnesium sulphate in the mixed solvent was determined. The effect of temperature on the association constant of the ion pair of magnesium sulphate was studied. The results showed that they agreed with the Harned-Robinson empirical equation:pK=A_1/T+A_2+A_3T. Secondarity, the effect of solvent dielectric constant on the dissociation constant followed the empirical equation:pK=g+h/D.
出处
《化学世界》
CAS
CSCD
北大核心
2004年第7期344-347,共4页
Chemical World
关键词
混合溶剂
硫酸镁
缔合常数
影响因素
mixed solvent
magnesium sulphate
association constant
influence factor
