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【题目】甲、乙、丙三种固体物质的溶解度曲线如右图所示,请回答:

(1)图中M点表示:____时,甲和乙的溶解度相等。

(2)溶解度随温度的升高而减小的物质是______。

(3)若要从甲的饱和溶液中获得甲晶体,常采

用_____ _ 的方法。

(4)t2时,将等质量的上述三种物质分别加入到100g水中,充分搅拌,如果得到的溶液只有一种是饱和溶液,则该饱和溶液中的溶质是______。

【答案】

t1 冷却热饱和溶液

【解析】

根据分析图像可得,M点表示的是在t1 温度时,甲和乙的溶解度相等。溶解度随温度升高而减小的物质是丙物质。甲的溶解度随温度升高而增大,需要采用冷却热饱和溶液来提纯晶体。若向100g水中添加相同质量的物质,只有一种溶液是饱和状态,说明只有在相同温度(t2)条件下,溶解度小的可以是饱和状态,符合以上要求的只有丙物质。

知识点:溶解度曲线的运用。

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