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【简答题】
如图分别表示A、B、C三种物质的溶解度曲线，试回答： （1）M点的含义是________ （2）温度为t 2 ℃时三种物质的溶解度的大小关系是_________ （3）将C物质接近饱和的溶液变为饱和溶液常用的方法是________ （4）t 2 ℃的等质量的A、B、C三种物质的饱和溶液分别降温到t 1 ℃析出晶体最多的是________物质 （5）在20℃时，向50克的水中加入10克A物质，充分溶解后所得的溶液为__________(填“饱和溶液”或“不饱和溶液”)，若是饱和溶液，以下两空可以不填。若是不饱和溶液，如果要使它成为20℃时的饱和溶液，则可以加入________克的A物质；或是蒸发_________克的水。 （6）若A中混有少量的B物质，分离出A物质常用的方法是_________.
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