【摘要】 本文报道对水合Cr（III）离子的聚合过程及其生成多核化合物进行研究的结果.配制几组硝酸铬溶液,使其中Cr（III）离子浓度和pH值不同而离子强度相同.一般约需一个月始达平衡,然后测定其pH值.数据按“根+节”理论处理,结果表明溶液中生成一系列通式为Cr[Cr（OH）₂]_n^（3+n）+的络合物,式中n=1,2和3.用曲线拟合法、投影带法、曲线外推法等三种方法计算,所得平衡常数K_n极为一致.更多还原

【Abstract】 Hydrolytic polymerization of Cr³⁺ has been studied.Several series of chromicnitrate solutions of different concentrations and pH at constant ionic strength were prepared and studied pH-metrically after equilibrium had established which usually took about one month. The data were treated according to the "Core plus Links" theory. The results showed that a series of complexes of the formula Cr[Cr（OH）₂]_n³⁺ⁿ were formed with n=1, 2 and 3. The formation constants K_n were calculated by three methods:curve fitting, projection strip and curve extrapolation. Concordant values were obtained.更多还原