A.1∶1∶1 | B.3∶3∶2 | C.1∶2∶3 | D.1∶1∶2 |
A.n(H2SO4)=0.1mol | B.n(H2SO4)=0.2mol |
C.0.1mol<n(H2SO4) <0.2mol | D.0.1mol≤n(H2SO4)≤0.2mol |
A.25℃时,0.1mol/L pH=4.5的NaHC2O4溶液: c(HC2O4-)>c(H2 C2O4)>c(C2O42-) |
B.NaHCO3溶液:c(OH-)=c(H+)+c(HCO3-)+2c(H2CO3) |
C.25℃时,pH=9、浓度均为0.1mol/L的NH3·H2O 、NH4Cl混合溶液: c(NH4+)+(H+)>c(NH3·H2O)+c(OH-) |
D.0.1mol/L(NH4)2Fe(SO4)2溶液中: |
A.Fe2+ | B.Mg2+ | C.CO32— | D.Ba2+ |
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