the pH scale is used to show how acidic or basic a substance is... you usually use red or blue litmus paper, and then using the label that comes with the paper, figure out how acidic or basic it is...
hoe acidic or basic a substance is 0-14 scale 7 is neutral like water
pH indicates potential hydrogen weak acid, strong acid, neutral, weak alkali and strong alkali. Acids are pH 1-6, Alkalies are pH...