弱酸指示剂的酸常数为KHln,若以该指示剂作为酸碱滴定的指示剂,则溶液的pH,pKHln和确定的颜色存在的正确关系是()。

A、若 pH=pKHln,将观察到指示剂的颜色

B、若pH=pKHln-1,将观察到指示剂的碱式色

C、若pH=pKHln-1,将观察到指示剂的混合色

D、若 PH=pKHln=1,将观察到指示剂的碱式色

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