[已知:δ(X)=]
A.反应A3-+H2A-⇌2HA2-的平衡常数的值为105.2 |
B.物质的量浓度均为0.1mol·L-1的KH2A、K2HA混合溶液中:c(K+)>c(HA2-)>c(H2A-)>c(H+)>c(A3-)>c(OH-) |
C.欲用H3A和K2HA配制pH=7.2的缓冲溶液(KH2A和K2HA的混合溶液),则需n(H3A):n(K2HA)=1:2 |
D.将KOH溶液还滴加入到H3A溶液中,反应H2A-+OH-=HA2-+H2O发生的pH范围是4.7~9.8 |
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