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NO3-在中性或碱性溶液中的氧化性极弱,通常认 为不显氧化性,但在酸性溶液中显示极强的氧化性,可 以氧化许多具有还原性微粒。这一知识是中学化学的 重点,也是高考中的热点,命题者往往会利用NO3-性 质上的这一特殊性在题目中设置陷阱,因此需要考生 对这一知识予以高度重视,教师在教学中也要总结这 一知识,以强化训练效果。现举几例,加以研讨。 例1往浅绿色的Fe(NO3)2溶液中逐滴加入稀 盐酸时,溶液的颜色变化应该是 ( )
NO3- is very weak in oxidation in neutral or alkaline solutions and is generally considered to be insignificantly oxidizing but shows strong oxidizing properties in acidic solutions and can oxidize many reducing particles. This knowledge is the focus of middle school chemistry, and is also a hot spot in the college entrance examination. Propositioners often use this particularity of the NO3-property to set traps in the subject. Therefore, candidates need to attach great importance to this knowledge, and teachers in teaching Also sum up this knowledge to strengthen the training effect. Here are some examples to discuss. Example 1 When dilute hydrochloric acid is added dropwise to a pale green Fe(NO3)2 solution, the color change of the solution should be ()