中文摘要：

根据配位化学的热力学平衡原理，绘制C02＋ -H2O体系的羟基配合离子的浓度pc-pH图、配离子分率6c。_pH图（1gan-pH图）和Co（OH）2的条件溶度积pPs-pH图。pc—pH图描述Co（OH）2（s）溶解平衡时钴的总离子平衡浓度与pH值的关系。当pH值为10～13时，Co（OH）2（s）的溶解度最小；a。_pH图指出各种羟基配离子分率与pH值的关系，在不同pH值条件下，钴离子形成不同种类的羟基配离子；溶液中主要存在Co（OH）’、Co（OH）3-、Co（OH）42-、C04（OH）4＋这4种羟基配离子以及少量Co（OH）2和C02（0H）3＋。pPs-pH图显示了Co（OH）2（s）的条件溶度积与对应pH值之间的关系：当pH值为9～11时，Co（OH）2（s）的条件溶度积最小。

英文摘要：

Based on the thermodynamic equilibrium principle of complex chemistry, the diagrams for the concentration of complex ions pc-pH, the ratio of Co2＋ hydroxyl complex ions an-pH, conditional solubility product of the hydrate to pH in the C02＋ -H2O system were drawn, respectively. The relationship between the equilibrium concentration of total cobalt ions and pH value was shown in C02＋ -H2O system, when the dissolution of Co（OH）2 is in equilibrium. The solubility of Co（OH）2 is the least at pH value of 10-13. The relationship of hydroxyl complex ions and pH value is shown in the diagram of an-pH, the cobalt ions will turn into different hydroxyl complex ions according to different pH values. There are Co（OH）＋, Co（OH）3-, Co（OH）4^2- and C04（OH）4^4＋ existing in the C02＋ -H2O system, and a little of Co（OH）2 and C02（OH）3＋. The diagram for the conditional solubility product pPs-pH indicates that the PPs reaches the minimum value at pH value ranging from 9 to 11.