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正确书写离子方程式是中学化学的重要技能之一,现介绍以下几种不易掌握的离子方程式的书写规则。一、酸式盐溶液与碱溶液的离子方程式酸式盐与碱反应一般生成正盐和水。当酸式盐与碱含有相同阳离子时,则只生成一种正盐。〔例〕NaHCO_3溶液与 NaOH 溶液的反应:NaHCO_3+NaOH=Na_2CO_3+H_2O离子方程式:HCO_3~-+OH~-=CO_3~(2-)+H_2O当酸式盐与碱含有不同阳离子时,可生成两种正盐。〔例〕NaHCO_3与 Ba(OH)_2两种溶液反应
Correctly writing the ion equation is one of the important skills of middle school chemistry. Now we will introduce the writing rules of the following ion equations that are difficult to grasp. I. Ionic formula of acid salt solution and alkali solution The acid salt reacts with alkali to form normal salt and water. When the acid salt and the base contain the same cation, only one normal salt is formed. [Example] Reaction of NaHCO 3 solution with NaOH solution: NaHCO 3 + NaOH = Na 2 CO 3 + H 2 O ion Equation: HCO 3 - - + OH - - CO 3 - (2) + H 2 O When acid salts and bases contain different cations, they can be generated. Two kinds of normal salt. [Example] Reaction of NaHCO 3 with Ba(OH) 2