要熟练地书写离子方程式,除了应掌握“两用”(易溶解、易电离的物质用实际参加反应的离子表示,非电解质、弱电解质、气体、不溶物用化学式表示)、“两查”(检查化学计量数和反应条件)和“两守恒”(质量守恒和电荷守恒)外,还要注意以下问题。 To skillfully write ion equations, in addition to mastering “two-use” (dissolvable, easily ionized substances are represented by ions that actually participate in the reaction, non-electrolytes, weak electrolytes, gases, insolubles are represented by chemical formulas), “two checks” ( Check the stoichiometric and reaction conditions) and “two conservations” (mass conservation and charge conservation), but also pay attention to the following issues.