题目:
常温下,在pH值都等于9的NaOH和CH3COONa两种溶液中,设由水电离产生的OH- 离子浓度分别为A mol/L与Bmol/L,则A和B关系为 ( )
A.A>B B.A=10-4 B C.B=10-4 A D.A=B
答案:
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