1. (2023·开封模拟) 表中是不同温度时固体KNO₃、KCl的溶解度，图示是依据数据绘制的溶解度曲线。                                                                                                                                                                                                                                                      

温度/℃		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	21.0	34.0	37.0	40.0	42.6	45.5	48.3

图中M表示固体物质的溶解度曲线，温度t的范围是，60℃时，100g10%KCl溶液蒸发g水可获得20%的溶液。