A is a solution of HNO3 of unknown concentration. B is a standard solution of Naoh 25cm3 portion of solution B required an average of 24.00cm3 of solution A for complete neutralization.

(1) suggests with reason a suitable indicator for
the reaction

2 answers

An indicator that changes color at pH = 7. Look in your text for a list of indicators with pH color change. I'm sure you can find a table on google.
Bromothymol Blue