The pH scale, which goes from 0 to 14 and considers 7 to be neutral, determines how acidic or alkaline a substance and those with a pH of less than 7 are acidic, and those with a pH of more than 7 are basic or alkaline. These are solutions that don't react with added acids or bases to affect their PH neutralizer. The pH scale, which goes from 0 to 14 and considers 7 to be neutral, determines how acidic or alkaline a substance and those with a pH of less than 7 are acidic, and those with a pH of more than 7 are basic or alkaline. These are solutions that don't react with added acids or bases to affect their PH neutralizer.The pH scale, which goes from 0 to 14 and considers 7 to be neutral, determines how acidic or alkaline a substance and those with a pH of less than 7 are acidic, and those with a pH of more than 7 are basic or alkaline. These are solutions that don't react with added acids or bases to affect their PH neutralizer.