已知硫酸铅难溶于水,也难溶于硝酸,却可溶于醋酸铵溶液形成无色溶液,其化学方程式是 PbSO4+2CH3COONH4==Pb(CH3COO)2+(NH4)2SO4。当在Pb(CH3COO)2(醋酸铅)溶液中通入H2S时,有黑色沉淀PbS生成。表示这个反应的有关离子方程式正确的是
A.Pb(CH3COO)2+H2S==PbS↓+2CH3COOH |
B.Pb2++H2S==PbS↓+2H+ |
C.Pb2++2CH3COO-+H2S==PbS↓+2CH3COOH |
D.Pb2++2CH3COO-+2H++S2-="=PbS↓+2" CH3COOH |