A.25℃时,同浓度的NaHC2O4溶液的pH比NaHCO3大 |
B.用0.5mol/L的草酸钠溶液浸泡CaCO3,可实现CaCO3完全转化为CaC2O4 |
C.某温度下,向含CaC2O4固体的饱和CaC2O4溶液中加入少量草酸钠固体,则CaC2O4溶解性将减小 |
D.过量CaCO3溶于水达到溶解平衡,其上层清液中含碳微粒主要是CO |
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