A.上述Na2CO3体系呈中性时,一定是10-3.25 |
B.符合c()>c()>c(H2CO3)的pH范围:6.37<pH<10.25 |
C.pH=9,c(Mg2+)=0.01mol/L时,溶液中只存在MgCO3沉淀 |
D.pH=8,c(Mg2+)=0.1mol/L时可发生反应:Mg2++2=Mg(OH)2↓+CO2↑ |
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