
A.0.1 mol·L−1 H2A溶液中有c(H+)-c(OH−)-c(A2−)=0.1 mol·L−1 |
B.当滴加至中性时,溶液中c(Na+)=c(HA−)+2c(A2−),用去NaOH溶液的体积小于10 mL |
C.当用去NaOH溶液体积10 mL时,溶液的pH<7,此时溶液中有c(A2−)=c(H+)-c(OH−) |
D.当用去NaOH溶液体积20 mL时,此时溶液中有c(Na+)=2c(HA−)+2c(A2−) |

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

