已知电池(饱和)|Hg2Cl2|Hg的电动势为0.762V,=0.244V,求HA的解离常数(忽略液接电位及离子强度)。
把1 LpH=10的氢氧化钠溶液加水稀释到10 L,溶液的pH为
A.1 B.8
C.9 D. 11
将30 mL 0. 5 mol/L NaCl溶液加水稀释到500 mL,稀释后溶液中NaCl的物质的量浓度为()。
A.0.03mol/L
B.0.3mol/L
C.0.05mol/L
D.0.04mol/L
某弱碱A-的=5×10-10,则HA的为().
A.5×10-6
B.2×10-6
C.5×10-8
D.2×10-10
Had the doctor been available,the child______.
A.could not die
B.would not die
C.would not have died
D.could not have died
Many people are reported______ in the natural disaster.
A.being killed
B.to be killed
C.to have killed
D.to have been killed