电导法测定杂多酸在非水溶液中的离解常数

本文以电导法测定了１２－磷钨、１２－硅钨酸在一些醇、酯、醛、酮等含氧有机溶剂以及乙腈中的离解常数，得到的结果表明，两种酸在同种溶液中的离解常数接近，磷钨酸的略高，同一种酸在不同溶剂中的离解常数则与溶剂的介电常数有密切关系。在醚中，因杂多酸与溶剂发生缔合作用，用电导法得不到其离散常数。

Conductometric Determination of Dissociation Constants of Heteropoly Acids in Nonaqueous Solvents

The dissocitaion constants of 12-HPW and 12-HSiW heteropoly acids in nonaqueous solvents such as alcohols, esterss, ditones, ethers etc. were measured by a conductometric method. Results show that the dissociation constants of both acids are nearly equal in the same solvent; the disscciation constants of either acid in different solvents are closely related to the dielectric constants of solvents. The dissociation constants could not be determined in ether due to the association betwecn the solvent and the acid.