You will be utilizing bromothymol blue as an indication for the back titration of your acidified antacid tablet with an aqueous NaOH solution looking for a color change at the equivalence point. In the initial acidic solution, bromothymol blue will be When the equivalence point is reached after addition of aq NaOH the solution will be Question 2 Fill in the blanks below for the appropriate equation for the reaction of acetic acid (CH3COOH) with 0.1M aqueous NaOH. acid + base conjugate acid + conjugate base