温度/℃ | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | |
溶解度/g | MgSO4 | 33.7 | 38.9 | 44.5 | 50.6 | 54.6 | 55.8 | 52.9 | 52.2 |
KCl | 34.0 | 37.0 | 40.0 | 42.6 | 45.5 | 48.3 | 51.1 | 54.0 |
请分析后回答下列问题: