右图表示硝酸钾和氯化钠的溶解度曲线。请根据图回答下列问题: 用“NaCl”或“KNO 3 ”填空: ①在 20 o C时, 的溶解度较大。 ②在t 1 o C时,分别取两杯80g水,各加入适量硝酸钾、氯化钠分别配成饱和溶液,将温度都升至t 2 o C时,若使溶液仍然是饱和溶液,则加入 的质量多。 ③若采用冷却热饱和溶液的方法,可从硝酸钾和氯化钠的混合物中分离出的物质是 。
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