配平注意事项: 写出的方程式必须与实验事实相符合 反应介质:酸性介质中,不能出现OH 碱性介质中,不能出现H+ In acidic solution balance o by adding h,o to the side of each half-reaction that needs o. and then balance h by adding Ht to the side that needs h In basic solution balance o by adding h,o to the side that needs o. Then balance H by adding H2o to the side that needs h. and for each h o molecule added add an oh- ion the the other side 难溶或弱电解质应写成分子形式 注明沉淀的生成,气体的产生等配平注意事项： 写出的方程式必须与实验事实相符合 • 反应介质： 酸性介质中，不能出现 OH－ 碱性介质中，不能出现 H＋ In acidic solution, balance O by adding H2O to the side of each half-reaction that needs O, and then balance H by adding H+ to the side that needs H. In basic solution, balance O by adding H2O to the side that needs O. Then balance H by adding H2O to the side that needs H, and for each H2O molecule added, add an OH￾ion the the other side. • 难溶或弱电解质应写成分子形式 • 注明沉淀的生成，气体的产生等