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    【题目】下列有关溶液的说法中，正确的是（ ）

    A．已达到饱和的氯化钠溶液中不能再溶解其他物质

    B．20℃时，50g水中最多溶解18g氯化钠，则20℃时氯化钠的溶解度为18g

    C．任何物质的饱和溶液在升高温度时，一定会变成该物质的不饱和溶液

    D．相同温度时，同种溶质的饱和溶液一定比它的不饱和溶液浓

    【答案】D

    【解析】已达到饱和的氯化钠溶液中不能再溶解氯化钠，但仍可以溶解其他物质，A错；溶解度指的是一定温度时，100g溶剂中最多溶解的溶质的质量，因此，根据20℃时，50g水中最多溶解18g氯化钠可知，20℃时氯化钠的溶解度为36g，B错；对于溶解度随温度升高而增大的物质，其饱和溶液在升高温度时，一定会变成不饱和溶液，而对于溶解度随温度升高而减小的物质，其饱和溶液在升高温度时，会析出晶体，所得溶液仍然是饱和溶液，C错．

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