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关于无机盐的溶解度问题,前人曾提出了许多溶解度公式。对于氢氧化物溶解度的研究,有实际意义的是Clifford、忻新泉等人的工作。Clifford从分子的极性出发,提出—个难溶盐的溶度积常数与电负性的关系式。该式虽然适于多种类型的难溶盐,然而只有对成键元素电负性差值小于0.5的化合物才是有效的,而且参数项的变化也较复杂。忻新泉提出下面的经验公式 PK_m=Z~2/r+a (1)式中,PK_m是一千克水中溶解氢氧化物克分子的负对数。Z为阳离子价数。r为阳离子半径。a是与阳离子构型有关的常数。该式较简单,对大部分氢氧化物PK_m值的计
On the solubility of inorganic salts, many people have proposed a formula for solubility. For the study of the solubility of hydroxide, what is of practical significance is the work of Clifford and Xin Xinquan et al. Based on the polarity of the molecule, Clifford proposed the relationship between the solubility product constant and the electronegativity of a sparingly soluble salt. Although this formula is suitable for many types of poorly soluble salts, only compounds that have a difference of less than 0.5 in the electronegativity of the bond-forming elements are effective, and the variation of parameter items is also complicated. Xin Xinquan proposed the following empirical formula PK_m = Z ~ 2 / r + a (1) where PK_m is the negative logarithm of the mole of dissolved hydroxide in one kilogram of water. Z is the cation valence. r is the cation radius. a is a constant related to the configuration of the cation. The formula is simpler, for most of the hydroxide PK_m value of the meter