A.0℃时,NH4Cl的溶解度大于NaCl的溶解度 |
B.NH4Cl中含有少量NaCl,可用降温结晶的方法提纯NH4Cl |
C.20℃时,NaHCO3饱和溶液的溶质质量分数一定大于NH4Cl不饱和溶液的溶质质量分数 |
D.20℃时,将9.6gNaHCO3加入到90.4g水中,可得到100g饱和溶液 |
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