單項(xiàng)選擇題0.1mol/L Ag(NH32+溶液的物料平衡式是()

A.[Ag+]=[NH3]=0.1mol/L
B.2[Ag+]=[NH3]=0.2mol/L
C.[Ag+]+[Ag(NH3)+]+2[Ag(NH32+]=0.1mol/L
D.[NH3]+[Ag(NH3)+]+2[Ag(NH32+]=0.2mol/L


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1.單項(xiàng)選擇題于60mL 0.10mol/L Na2CO3溶液中加入40mL 0.15mol/L HCl溶液,所得溶液的簡化質(zhì)子條件是()

A.[H2CO3]=[HCO3-]
B.[HCO3-]=[CO32-]
C.[H2CO3]=[CO32-]
D.[H2CO3]=[H+]

4.單項(xiàng)選擇題已知:H3PO4的pKa1=2.12,pKa2=7.20,pKa3=12.36,調(diào)節(jié)磷酸鹽溶液的pH至6.0時(shí),其各有關(guān)存在形式濃度間的關(guān)系是()

A.[HPO42-]>[H2PO4-]>[PO43-]
B.[HPO42-]>[PO43-]>[H2PO4-]
C.[H2PO4-]>[HPO42-]>[H3PO4]
D.[H3PO4]>[H2PO4-]>[HPO42-]

5.單項(xiàng)選擇題

pH=7.00的H3AsO4溶液有關(guān)組分平衡濃度的關(guān)系應(yīng)該是()
(已知H3AsOpKa1=2.20,pKa2=7.00,pKa3=11.50)

A.[H3AsO4]=[H2AsO4-]
B.[H2AsO4-]=[HAsO42-]
C.[HAsO42-]>[H2AsO4-]
D.[H3AsO4]>[HAsO42-]