A.20°C时硝酸钾溶液和氯化钠溶液中溶质质量分数相等
B.80°C时硝酸钾和硝酸钠的饱和溶液降温至10°C,析出硝酸钾的质量大于硝酸钠的质量
C.硝酸钠中混有少量氯化钠,利用降温结晶可提纯硝酸钠
D.t°C时将质量均为mg的上述三种物质分别加入50g水,充分溶解只形成一种不饱和溶液,则m的取值范围为
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