Ka（酸的平衡常数）pKa就是该酸的平衡常数的负对数值,类似于pH,pKa可以称为酸度.
酸度值为5.包含这个酸和它的共轭碱的溶液的pH是6.那共轭碱的浓度和酸的浓度的比值是多少?（共轭碱：酸）
The pKa of acid is 5.The pH of a solution containing acid X
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