浓度为c mol-1的(NH4)2HPO4溶液的质子条件式为:
A.
c(H + )=c(OH - )+c(NH 3 )+c(H 2 PO 4 )+2c(H 3 P O 4 ) _ c(PO 4 3 - )
B.
c(H + )=c(OH - )+c(NH 3 )+c(PO 4 3- )+2c(H 2 PO 4 )-2c(H 3 P O 4 )
C.
c(H + )=c(OH - )+c(NH 3 )+c(PO 4 3- )-c(H 2 PO 4 )-2c(H 3 P O 4 )
D.
c(H + )=c(OH - )+2c(NH 3 )+c(HPO 4 2- )