温度/℃ | 0 | 20 | 40 | 60 | 80 |
溶解度/g | 42 | 109 | 129 | 174 | 314 |
A.20℃时,200g水中能溶解218gNaOH |
B.NaOH的溶解度随温度的升高而减小 |
C.将40℃的NaOH饱和溶液升高到60℃,其质量分数增大 |
D.将80℃的NaOH饱和溶液降温至20℃,析出晶体205g |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2