0.1mol·L-1HAc溶液中，已知pKa(HAc)=4.74
A. ［HAc］=[H3O+]+[Ac-]
B. ［H3O+］=[Ac-]
C. [H3O+]=[OH-]+[Ac-]
D. [H3O+]=[HAc]+[Ac-]
查看答案
向浓度为0.1mol.L-1醋酸溶液中加入少量醋酸钠
A. 溶液pH值减小
B. 溶液中Ac-浓度减小
C. 溶液中HAc的浓度增大
D. 溶液中OH-的浓度减小
下列物质中属于两性物质的有哪些？
A. NH3
B. H2O
C. HAc
D. HCO3-
下列说法正确的是
A. 某物质其酸性越强则其共轭碱的碱性越弱
B. 某物质其Ka值越小则其酸性越强
C. 某物质其pKb值越小则其碱性越强
D. 物质的酸性强弱一定与其浓度相关
[音频]What is the EU planning to do to EU citizens when they are 18?
A. allow them to go abroad on their own.
B. increase the price of their interrail pass (火车通票)
C. give them a one-month vacation.
D. give them a free interrail pass.
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