A net ionic equation is a reduced equation showing only the species that actually take part in the reaction, with the spectator ions omitted. By stripping away ions that are unchanged, it highlights the essential chemical change. It is obtained from the total ionic equation by cancelling the spectator ions that appear on both sides.

净离子方程式是只显示真正参与反应的物质、略去旁观离子的简化方程式。通过去除未发生变化的离子,它突出了本质的化学变化。它由全离子方程式消去两侧都出现的旁观离子而得到。