0.10 mol/L HCl和1.0 mol/L HAc(pKa = 4.74)混合液的pH为
A. 2.37
B. 1.3
C. 1
D. 3.37
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今欲配制一pH=7.20的缓冲溶液,所用 0.10 mol/L H3PO4和0.10 mol/L NaOH溶液的体积比是(H3PO4的pKa1~pKa3分别是2.12,7.20,12.36)
A. 1:3
B. 3:1
C. 2:3
D. 3:2
0.1 mol/L Ag(NH3)2+溶液的物料平衡式是
A. [Ag+] = [NH3] = 0.1 mol/L
B. 2[Ag+] = [NH3] = 0.2 mol/L
C. [Ag+]+[Ag(NH3)+]+2[Ag(NH3)2+] = 0.1 mol/L
D. [NH3]+[Ag(NH3)+]+2[Ag(NH3)2+] = 0.2 mol/L
于60 mL 0.10mol/L Na2CO3溶液中加入40 mL 0.15mol/L HCl溶液,所得溶液的简化质子条件是
A. [H2CO3] = [HCO3-]
B. [HCO3-] = [CO32-]
C. [H2CO3] = [CO32-]
D. [H2CO3] = [H+]
用0.10 mol/LNaOH溶液滴定0.10 mol/L HA(Ka=5.0×10-5), 若终点的pH为9.0, 则终点误差为
A. +0.02%
B. 1.0E-4
C. -2.0E-4
D. -1.0E-4
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