在20℃下,往盛有水的烧杯中不断加入Na NO3固体并搅拌,一段时间后烧杯底部有固体剩余,这是Na NO3饱和溶液吗?相信很多化学同行都会给出肯定的答案。若是以前,笔者也会非常肯定这就是Na NO3饱和溶液。无论是教材上的描述(百度百科中对饱和溶液的判断依据是“有固体剩余物”),还是同行的一些教学设计,基本上都对这种溶液是饱和溶液持肯定态度。然而,以下事情改变了笔者的这种看法。 At 20 ℃, to the beaker containing water constantly adding NaNO3 solid and stirring, at the bottom of the beaker after a period of solid residue, which is NaNO3 saturated solution? I believe many chemical colleagues will give a positive answer. If before, I will be very sure that this is Na NO3 saturated solution. Whether it is the description of the textbook (Baidu encyclopedia of saturated solution based on the judgment is “solid residue ”), or some teaching design counterparts, basically all of this solution is a positive solution to the saturated solution. However, the following things changed my opinion.