11. (1.5) Calculate the average of the pH values at the first and second color changes. This is the pK, of bromocresol green.
a. What must be true about the concentrations of HBG & HBG2 at this average pH that equals pK,?
b. Given your response in part a, show that pH = pk, based on the dominant equilibrium and its
symbolic K expression.

The pH of the first color change was 3.82 when it turned green and second pH is 5.40, it turned blue
Can someone help answering these question? Thank you