【題目】下列有關(guān)溶液的說(shuō)法中，正確的是（ ）

A．已達(dá)到飽和的氯化鈉溶液中不能再溶解其他物質(zhì)

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

C．任何物質(zhì)的飽和溶液在升高溫度時(shí)，一定會(huì)變成該物質(zhì)的不飽和溶液

D．相同溫度時(shí)，同種溶質(zhì)的飽和溶液一定比它的不飽和溶液濃

【答案】D

【解析】已達(dá)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(zhì)，A錯(cuò)；溶解度指的是一定溫度時(shí)，100g溶劑中最多溶解的溶質(zhì)的質(zhì)量，因此，根據(jù)20℃時(shí)，50g水中最多溶解18g氯化鈉可知，20℃時(shí)氯化鈉的溶解度為36g，B錯(cuò)；對(duì)于溶解度隨溫度升高而增大的物質(zhì)，其飽和溶液在升高溫度時(shí)，一定會(huì)變成不飽和溶液，而對(duì)于溶解度隨溫度升高而減小的物質(zhì)，其飽和溶液在升高溫度時(shí)，會(huì)析出晶體，所得溶液仍然是飽和溶液，C錯(cuò)．

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