When a titration curve was acquired by titrating 25ml boric acid solution with a 1M NaOH solution, answer the following by using the information given on the curve. Determine the concentration of the original boric acid solution?
Where the curve with initial acid pH equal to 4.17 0mL NaOH added, pH at halfway point is 9.137 with 10ml NaOH added, and pH at equivalence point is 11.40 with 20ml NaOH added. And measured the Ka for boric acid to be 7.29*10-10