How do pH values of acids and bases differ?
Greater or less than 7.
pH values range from 1 to 14. A neutral substance has a pH of 7. If the pH is less than 7 it is acidic and if greater than 7 it is basic. The farther it goes from 7 the stronger it becomes. An acid of pH 1-2 or a base of pH 13-14 are very strong or concentrated. An acid of pH 5-6 or a base of pH 9-10 are weak or dilute.