2. [4 marks] The measure of the acidity of a substance, pH, is given by the formula pH = - log (H+) where His the concentration of hydrogen ions in the substance. (a) Determine the concentration of hydrogen ions of seawater whose pl = 7.8. (b) The pH of milk is estimated to be about 6.7. How many times more intense is the concentration of hydrogen ions of seawater than that of milk? Round off to two decimal places