47. Which of the following indicators would be most suitable for the titration of sodium dihydrogen phosphate with 0.10 M sodium hydroxide? For phosphoric acid, = 7.21, and = 12.68. (A) bromocresol green, = 4.7 (B) litmus, = 6.5 (C) bromothymol blue, = 7.1 (D) phenolphthalein, = 9.4 (E) indigo carmine, = 12.2