KNO3和KCl在不同溫度時(shí)的溶解度如下表所示.請(qǐng)回答下列問(wèn)題:
溫度/℃ | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 |
溶解度/g | KNO3 | 13.3 | 20.9 | 31.6 | 45.8 | 63.9 | 85.5 | 110 | 138 |
KCl | 27.6 | 31.0 | 34.0 | 37.0 | 40.0 | 42.6 | 45.5 | 48.3 |
(1)依據(jù)上表數(shù)據(jù),繪制KNO
3和KCl的溶解度曲線,如圖中能表示KNO
3溶解度曲線的是________.(填“a”或“b”)
(2)由表中數(shù)據(jù)分析可知,KNO
3和KCl在某一溫度時(shí)具有相同的溶解度x,則x的取值范圍是:________.
(3)10℃時(shí),131g 飽和KCl溶液,蒸發(fā)10g水后,再降溫到10℃,可析出KCl晶體的質(zhì)量為_(kāi)_______.
(4)欲將60℃時(shí)不飽和硝酸鉀溶液變成飽和溶液,下列說(shuō)法正確的是________.
A.溶液中溶劑的質(zhì)量可能減少 B.溶液中溶質(zhì)的質(zhì)量可能增加
C.溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)一定增大 D.溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)可能不變.