25℃时,下列各溶液中有关物质的量浓度关系正确的是 [ ]
A.
pH=2的醋酸溶液与pH=12的NaOH溶液等体积混合:c(Na + )+ c(H + )= c(OH - )+c(CH 3 COO - )
B.
Na 2 CO 3 溶液中:2c(Na + ) =c(CO 3 2- )+c(HCO 3 - ) +c(H 2 CO 3 )
C.
NH 4 HSO 4 溶液中滴加NaOH至溶液恰好呈中性: c(Na + )>c(SO 4 2- ) >c(NH 4 + ) >c(OH - ) =c(H + )
D.
pH相同的CH 3 COONa溶液、C 6 H 5 ONa溶液、Na 2 CO 3 溶液、NaOH溶液: c(CH 3 COONa)>c(Na 2 CO 3 ) >c(C 6 H 5 ONa ) >c(NaOH )