【題目】下列有關溶液的說法中，正確的是（ ）

A．已達到飽和的氯化鈉溶液中不能再溶解其他物質

B．20℃時，50g水中最多溶解18g氯化鈉，則20℃時氯化鈉的溶解度為18g

C．任何物質的飽和溶液在升高溫度時，一定會變成該物質的不飽和溶液

D．相同溫度時，同種溶質的飽和溶液一定比它的不飽和溶液濃

【答案】D

【解析】已達到飽和的氯化鈉溶液中不能再溶解氯化鈉，但仍可以溶解其他物質，A錯；溶解度指的是一定溫度時，100g溶劑中最多溶解的溶質的質量，因此，根據(jù)20℃時，50g水中最多溶解18g氯化鈉可知，20℃時氯化鈉的溶解度為36g，B錯；對于溶解度隨溫度升高而增大的物質，其飽和溶液在升高溫度時，一定會變成不飽和溶液，而對于溶解度隨溫度升高而減小的物質，其飽和溶液在升高溫度時，會析出晶體，所得溶液仍然是飽和溶液，C錯．

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