Assume that the unshaded spheres in the buret represent H+ ions, the shaded spheres in the flask represent OH- ions, and you are carrying out a titration of the base with the acid. (Hint: Count the H+ and OH- ions present). If the volumes in the buret and the flask are identical and the concentration of the acid in the buret is 0.250 M, what is the concentration of the base in the flask?