根据氯化钠和硝酸钾的溶解度表与溶解度曲线(图1)回答下列问题：                                                                                                                                                                                

温度(℃)	20	30	40	50	60
氯化钠	36.0	36.3	36.6	37.0	37.3
硝酸钾	31.6	45.8	63.9	85.5	110.0