根据配位化学的热力学平衡原理,绘制Co2+-H2O体系的羟基配合离子的浓度pc-pH图、配离子分率αn-pH图(lgαn-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;αn-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-、Co4(OH)44+这4种羟基配离子以及少量Co(OH)2和Co2(OH)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.
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