要学好化学,要求学生具有较好的思维品质.在解题时,如果对基本原理比较熟悉的话,则可以通过特殊的定量关系来求解,往往起到事半功倍的效果.现举例如下:例1把ag铁铝合金粉末溶于足量盐酸中,再加入过量NaOH溶液.过滤出沉淀,经洗涤、于燥、灼烧,得到红棕色粉末的质量仍为ag,则原合 To learn chemistry well, students are required to have good thinking qualities. When solving problems, if they are familiar with the basic principles, they can solve them through special quantitative relationships, often playing a multiplier role. Examples are as follows: Example 1 Ag iron aluminum alloy powder is dissolved in sufficient amount of hydrochloric acid, and then excess NaOH solution is added. The precipitate is filtered, washed, dried, and burned to obtain a reddish-brown powder with ag quality.