不同pH条件下方程式的书写规则

Writing Rules of Equations Under Different pH Conditions

不同pH条件下,化学反应方程式书写时需要考虑体系中的主要物种。当有共轭酸碱对存在时,其平衡移动又提供H^(+)或OH^(-)以配平方程式。详细讨论了这类方程式书写时可以出现的和不可以出现的物种。对近年来高考和化学竞赛中涉及的方程式进行了分析和探讨,对部分方程式答案加以完善,并以此探讨了方程式书写的一般规则。

Under different pH conditions, the main species in the system need to be paid more attention when writing chemical reaction equations. When the ionization equilibrium produced by conjugate acid-base pair moves, hydrogen ions or hydroxide ions are generated to balance chemical equations. Species can or cannot appear when writing equations are discussed in detail. The general rule of writing equations gradually appears after the equations in the college entrance examination and national chemistry competition in recent years are carefully discussed with the revise of some equations.