What is the molarity of a phosphoric acid solution if 15. 66 mL of this H3PO4 solution requires 43. 81 mL of 0. 2283 M NaOH for titration to the equivalence point?
(a) 1. 925 M
(b) 0. 1597 M
(C) 0. 3193 M
(d) 0. 2129 M
(e) 0. 6387 M