When a good indicator has been chosen, the pH at which the solution changes color is very close to the

Question

equivalience point of the titration.

If this "point" for a particular titration occurs at pH x, a good indicator for the titration would be indicator.
X indicator
0.9 ?
1.5 ?
3.5 ?
6.1 ?
8.9 ?

Answer 1

What's the question?

Answer 2

the rest of the question asks: what is the indicator when X= 1.5, 3.5, 6.1, 8.9?