- During an acid-base titration reaction, a 2.0M solution was titrated into 10.0ml of a strong base of unknown concentration. The equivalence point is reached when: A. 5.0ml of have been added B. The moles of added equals the number of moles of ions in the 10.0ml of base. C. The solution changes color D. The number of protons added equals the number of hydroxide ions in the solution of unknown base E. There is not enough information to make a determination. Write down the balanced reaction if the base is NaOH