A.
0.1 mol/L NaHS溶液:c(OH - )=c(H + )+2c(H 2 S)+c(HS - )
B.
1 L 0.1 mol?L -1 (NH 4 ) 2 Fe(SO 4 ) 2 ?6H 2 O的溶液:c(SO 4 2- )>c(NH 4 + )>c(Fe 2+ )>c(H + )>c(OH - )
C.
25℃时,pH=9.4,浓度均为0.10 mol/L的HCN与NaCN的混合溶液:c(Na + )>c(CN - )>c(HCN)>c(OH - )
D.
浓度均为0.1 mol/L的Na 2 CO 3 与NaHCO 3 混合溶液:c(Na + )>c(HCO 3 - )>c(CO 3 2- )>c(OH - )