Explain how the numbers of the pH scale are related to acidity and basicity (Alkalinity.)
The greater the concentration of hydrogen ions in a solution, the greater the acidity. The greater the concentration of hydroxide ions in a solution, the greater the base, or alkalinity. This concentration is measured in pH units and each number represents a ten-fold change in the level of hydrogen and hydroxide ions present. The ph scale is listed in units from 0-14 with 7 being neutral. Zero is the highest acidity level and fourteen is the highest basic level.