杂多酸制备中pH调节问题？既然pH在变，说明反应还没完全，直到不变，然后才能继续搅拌。多酸的生成与pH关系很大。 谢谢老师的指导，我是合成的盐，用的是买来的杂多酸，还有一个特别棘手的事，我合成出的单缺位的硅钨酸盐极易溶于水，怎么重结晶了，能给我具体指导一下吗？文献表述如下：First PW12 (2.88 g) was dissolved in water (10 mL) and the pH of the solution was adjusted to 4.8 using NaHCO3 solution. This resulted in the formation of lacunary heteropoly anion [PW11O39]7. The solution having pH 4.8 was heated to 90 C with constant stirring. Then to it a solution of Co(NO3)26H2O (0.29 g) in water (10 mL) was added. The NaCoPW11 was obtained by solvent evaporation, and recrystallization from water, followed by subsequent drying at 110 C for 12 h查看更多
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