單項(xiàng)選擇題

用NaOH滴定某一元酸HA,在化學(xué)計(jì)量點(diǎn)時(shí),[H+]的計(jì)算式是()

A.A
B.B
C.C
D.D


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1.單項(xiàng)選擇題

NH4H2PO4水溶液中最主要的質(zhì)子轉(zhuǎn)移反應(yīng)是()
(已知H3PO4的pKa1~pKa3分別是2.12,7.20,12.36;NH3的pKb為4.74)

A.NH4++H2PO4-=NH3+H3PO4
B.H2PO4-+H2PO4-=H3PO4+HPO42-
C.H2PO4-+H2O=H3PO4+OH-
D.H2PO4-+H2O=HPO42-+H3O+

2.單項(xiàng)選擇題含0.10mol/L HCl和0.20mol/L H2SO4的混合溶液的質(zhì)子條件式是()

A.[H+]=[OH-]+[Cl-]+[SO42-]
B.[H+]+0.3=[OH-]+[SO42-]
C.[H+]-0.3=[OH-]+[SO42-]
D.[H+]-0.3=[OH-]+[SO42-]+[HSO4-]

3.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

4.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(jiǎn)化質(zhì)子條件是()

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