When a strong acid is titrated with a strong base, the equivalence point is at pH=7. Bromothymol blue is the best of the three indicators for this titration. But the color changes for methyl orange , bromothymol blue, and phenolphthalein will all occur at nearly the same volume of added Acid. This is because there is a huge jump at the equivalence point as shown in graph 1. From the result, the colour changes for the three diffrent indicator occur at nearly the same volume of hydrochloric acid used. For Phenolphthalein, the volume of the hydrochloric acid used is 37.30mL. For Methyl red, the volume of the hydrochloric acid used is 37.10mL. For Bromothymol blue , the volume of the hydrochloric acid used is 37.15mL. The range of the three reading
