A.已知Ka1(H2SO3) = 1.29× 10-2,由②可知向K2CrO4溶液中通SO2可制得KHCrO4 |
B.的值随溶液 pH的增大逐渐减小 |
C.当溶液pH=9时,溶液中的平衡浓度约为6 × 10-4mol/L |
D.当溶液pH=7时,c(K+) =c ( ) +c( ) +2c () |
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