Sometimes pH is defined as the logarithm of the reciprocal of the concentration of hydrogen ions. Write an equation that represents this sentence, and explain how it and the equation given in the information preceding Problem 67 can both represent pH.
Use the following information. Chemists use the pH (hydrogen potential) of a solution to measure its acidity or basicity. The pH is given by the formula
pH = - log[H+]
where [H+] is the concentration of hydrogen ions in moles per liter.