单项选择题
A.0.10mol·L-1 B.0.20mol·L-1 C.0.050mol·L-1 D.10-7mol·L-1
A certain weak acid is 10% dissociated in 1.0mol·L-1 so...
单项选择题A certain weak acid is 10% dissociated in 1.0mol·L-1 solution.In 0.10mol·L-1 solution，the percentage of dissociation would be（）。
A.greater than10 B.10 C.less than10 D.zero
Which one of the following ions would give a basic solu...
单项选择题Which one of the following ions would give a basic solution upon addition to water？（）
A.NH4+ B.Na+ C.C2H3O2- D.NO3-
配制pH=9.00的缓冲溶液，最好应选用（）A.NaHCO3–Na2CO3B.Na2HPO4-Na2HPO4C...
单项选择题配制pH=9.00的缓冲溶液，最好应选用（）
A.NaHCO3–Na2CO3 B.Na2HPO4-Na2HPO4 C.HAc–NaAc D.NH3·H2O-NH4Cl
