A.Al2(SO4)3溶液滴加氨水产生白色胶状沉淀: Al3++3OH-= Al(OH)3↓ |
B.90 ℃时,测得纯水中c(H+)·c(OH-) =3.8×10—13: H2O(l)H+(aq)+OH-(aq)H<0 |
C.FeCl3溶液中通入SO2,溶液黄色褪去:2Fe3++SO2 +2H2O = 2Fe2++SO42-+ 4H+ |
D.碳酸钠溶液滴入酚酞变红:CO32-+ 2H2O H2CO3+2OH- |
A.在硫化钠溶液中加入足量稀硝酸: S2-+ 2H+ = H2S↑ |
B.往氯化铁溶液中通入硫化氢气体: 2Fe3++ S2-= 2Fe2++ S↓ |
C.用惰性电极电解饱和食盐水:2Cl-+2H2O通电2OH-+ H2↑ + Cl2↑ |
D.乙醛的银镜反应:CH3CHO+2Ag(NH3)2OHCH3COO-+NH4++2Ag↓+3NH3+H2O |
A.明矾溶液中滴加过量氨水:Al3++3NH3·H2O===Al(OH)3↓+3NH |
B.醋酸溶液与Mg(OH)2反应:Mg(OH)2+2H+===Mg2++2H2O |
C.小苏打溶液中加足量澄清石灰水:2HCO+Ca2++2OH-===CaCO3↓+2H2O+CO |
D.SO2通入FeCl3溶液中:SO2+Fe3++2H2O===SO+Fe2++4H+ |
A.Cl2通入水中:Cl2+H2O2H++Cl-+C1O- |
B.钢铁发生吸氧腐蚀时,铁作负极:Fe-3e-=Fe3+ |
C.向双氧水中加入稀硫酸和KI溶液:H2O2+2H++2I-=I2+2H2O |
D.用铜作阳极电解CuSO4溶液:2Cu2++2H2O2Cu+O2+4H+ |
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