- (B) The pH is −log[H+]. A 0.005 molar solution of H 2 SO 4 ionizes in a dilute
solution to release two H+ ions per molecule of H 2 SO 4. Therefore, the molar
concentration of H+ ion is 2 × 0.005 mol/L or 0.010 mol/L. Substituting this in
the formula, you have:pH = −log [0.01] = −log [1 × 10−2]The log of a number is the exponent to which the base 10 is raised to
express that number in exponential form:−log [1 × 10−2] = −[−2] = 2