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【題目】甲、乙、丙三種固體物質的溶解度曲線如右圖所示,請回答:

(1)圖中M點表示:____時,甲和乙的溶解度相等。

(2)溶解度隨溫度的升高而減小的物質是______。

(3)若要從甲的飽和溶液中獲得甲晶體,常采

用_____ _ 的方法。

(4)t2時,將等質量的上述三種物質分別加入到100g水中,充分攪拌,如果得到的溶液只有一種是飽和溶液,則該飽和溶液中的溶質是______。

【答案】

t1 冷卻熱飽和溶液

【解析】

根據分析圖像可得,M點表示的是在t1 溫度時,甲和乙的溶解度相等。溶解度隨溫度升高而減小的物質是丙物質。甲的溶解度隨溫度升高而增大,需要采用冷卻熱飽和溶液來提純晶體。若向100g水中添加相同質量的物質,只有一種溶液是飽和狀態,說明只有在相同溫度(t2)條件下,溶解度小的可以是飽和狀態,符合以上要求的只有丙物質。

知識點:溶解度曲線的運用。

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