DOC《第五章 沉淀反应》

一、影响难溶电解质沉淀的因素(The Affect Factors on Precipitation of Undissolved Electrolytes) 1.同离子效应(Common Cion effect):难溶电解质的溶解度,因加入有共同离子的强电解质而降低的效应. Sample Exercise 1:Calculate the molar solubility of CaF2 at 25℃ in a solution containing (a) 0.0100 mol・dm(3Ca(NO3)2(aq);

(b) 0.010 mol・dm(3 NaF(aq). Solution:设在(a)溶液中CaF2(s)溶解度为x mol・dm(3. CaF2(s)CaF2+(aq) + 2F-(aq) 0.010 + x 2x (0.010 + x) ・ (2x)2 = 3.9(10(11 , ∵ x