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錯.實驗室將某氯化鈉溶液蒸發溶劑,析出晶體,其溶質品質分數可能變大或不變.如果本身就是一個飽和溶液,蒸發後,析出晶體.母液還是飽和溶液,品質分數不變;如果本身是一個不飽和溶液,蒸發後,析出晶體,母液中溶質的品質分數不變.
1.2/15=8%
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