How many protons [or, more accurately, hydronium ions (H3O+)] are there in a spherical lysosome that is about 0.6 µm in diameter and maintains an interior pH of about 5.0? Recall that the volume of a sphere of radius r is calculated as V = 4/3 × π × r3, and that pH = –log [H+]. Avogadro’s constant is approximately 6 × 1023 molecules/mole A. About 7,000,000 ions B. About 700 ions C. About 7,000 ions D. About 70,000 ions E. About 700,000 ions 0