下图是甲乙两种固体物质的溶解度曲线。据图回答:(1)P点的含义

下图是甲乙两种固体物质的溶解度曲线。据图回答:

(1)P点的含义是_______                             
(2)要使某温度时接近饱和的甲溶液变成饱和溶液,
可采用的方法有__________                  (写出一种)
(3)当甲中含有少量乙时,可采用____________    的方法提纯甲 。
(4)30℃时,将40g甲物质放入盛有50g水的烧杯中,
所得溶液溶质的质量分数为___ _     ;若将烧杯内物质升
温到50℃(不考虑水蒸发),溶液中变化的是_____   (选填A、B、C、D)
A、溶剂的质量     B、溶液的质量    C、溶质的质量分数      D、以上都不变

答案

(1)在30℃时甲的溶解度是60g。
(2)降低温度(增加甲物质、恒温蒸发溶剂)(写出一种)
(3)冷却热饱和溶液(冷却结晶、降温结晶)
(4)37.5%;     B C。解析:

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