A.0.5mol·L-1Na2CO3溶液中存在:c(OH-)=c(H+)+c(HCO)+c(H2CO3) |
B.反应CaSO4+COCaCO3+SO正向进行,需满足>×104 |
C.过滤后所得清液中一定存在:c(Ca2+)=且c(Ca2+)≤ |
D.滤渣中加入醋酸发生反应的离子方程式:CaCO3+2H+=Ca2++CO2↑+H2O |
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