SAT化学 10分 急!Bromothymol blue is an acid/base indicator with a pKa of 6.8. Therefore, at approximately what PH will bromothymol blue undergo a color change during an acid/base titration?答案是7.为什么

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SAT化学 10分 急!
Bromothymol blue is an acid/base indicator with a pKa of 6.8. Therefore, at approximately what PH will bromothymol blue undergo a color change during an acid/base titration?
答案是7.为什么

文中说溴百里酚蓝是一种酸碱指示剂,其酸碱平衡pKa为6.8,实际上溴百里酚蓝的pKa为7.10.所以答案说是7(也是近似的,或者资料来源不一致所致).