如图是甲、乙、丙三种固体物质的溶解度曲线,且它们溶于水时溶液

如图是甲、乙、丙三种固体物质的溶解度曲线,且它们溶于水时溶液温度均无明显变化.回答下列问题

(1)丙物质的溶解度随温度升高而  (填“增大”或“减小”).

(2)t1℃时,三种物质的溶解度大小顺序为  

(3)t2℃时,等质量的甲、丙两种物质的饱和溶液中溶剂的质量大小关系为甲  丙(填“>”、“<”或“=”).

(4)若要将组成N点的甲溶液转变成M点的甲溶液,可以采用的方法是  

答案

【分析】根据题目信息和溶解度曲线可知:甲、乙两种固体物质的溶解度,都是随温度升高而增大,而丙的溶解度随温度的升高而减小;t1℃时,三种物质的溶解度大小顺序为丙>乙>甲;t2℃时,等质量的甲、丙两种物质的饱和溶液中溶剂的质量大小关系为甲等于丙,因为该温度下,它们的溶解度相等;若要将组成N点的甲溶液转变成M点的甲溶液,可以采用的方法是增加溶质或蒸发溶剂.

【解答】解:(1)由溶解度曲线可知:丙的溶解度随温度的升高而减小,故答案为:减小;

(2)t1℃时,三种物质的溶解度大小顺序为丙>乙>甲;故答案为:丙>乙>甲;

(3)t2℃时,等质量的甲、丙两种物质的饱和溶液中溶剂的质量大小关系为甲等于丙,因为该温度下,它们的溶解度相等;故答案为:=;

(4)若要将组成N点的甲溶液转变成M点的甲溶液,可以采用的方法是增加溶质或蒸发溶剂,故答案为:增加溶质或蒸发溶剂

【点评】本考点考查了溶解度曲线及其应用,通过溶解度曲线我们可以获得很多信息;还考查了有关饱和溶液与不饱和溶液的相互转化等,本考点主要出现在选择题和填空题中.

 

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