问答题

一学生需要-pH为3.90的缓冲溶液，若用甲酸及其盐配制该缓冲溶液，能否满足要求？若能，则酸根离子与甲酸HCO₂H的浓度比应为多少？

A.90的缓冲溶液，若用甲酸及其盐配制该缓冲溶液，能否满足要求？若能，则酸根离子B.174.24.96:6088/Latex/latex.action?latex=SENPX3syfV57LX0%3D'

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单项选择题

中国革命的中心问题是( )
A．无产阶级的领导权 B．搞清中国的国情
C．新民主主义总路线 D．新民主主义纲领

A.无产阶级的领导权
B.搞清中国的国情

C.新民主主义总路线

已知H₃AsO₄的逐级酸常数分别为、、，则的值及其共轭酸为( )。
(A) , (B) ,
(C) H₃AsO₄ (D) , H₃AsO₄

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