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前文曾述及在70°时,与自由草酸浓度较低之溶液成平衡的固相,似非具固定组成的化合物,而是组成随浓度变化的混晶.为确证这一点,故用前两篇中所用的方法先后进行了下述二系列的实验.其一仍从[Co(NH_3)_5H_2O]_2(C_2O_4)_3·4H_2O出发,在70°及自由草酸浓度为1.9-2.3M范围内研究本体系.另一系列则从[Co(NH_3)_5C_2O_4]_2C_2O_4·4H_2C_2O_4出发,在70°及自由草酸浓度为1.9-4.0M范围内研究同一体系.由于最初是在自由草酸浓度约为2M附近观察到似乎有混晶存在,所以我们在第一系列实验中所用
It has been previously stated that the solid phase, which is at equilibrium with a solution of lower free oxalic acid concentration at 70 °, appears to be a non-fixed composition of the compound but a mixed crystal which varies in concentration. To confirm this, The following two series of experiments have been carried out in the following method: one is still starting from [Co (NH_3) _5H_2O] _2 (C_2O_4) _3 · 4H_2O at 70 ° and free oxalic acid concentration of 1.9-2.3M In the other series, the same system was studied at [Co (NH_3) _5C_2O_4] _2C_2O_4 · 4H_2C_2O_4 at 70 ° and free oxalic acid concentration of 1.9 to 4.0 M. Since the initial concentration of free oxalic acid was observed around 2 M There seems to be mixed crystals, so we used it in the first series of experiments