Alkaline Solutions: Alkaline substances, also known as basic substances, have a pH value above 7 on the scale. They contain a higher concentration of hydroxide ions (OH-) than hydrogen ions (H+).

The pH scale gives a measure of the strength of an acidic or alkaline solution. The range for the pH scale is 0 (strong acid) to 14 (strong alkali). pH 0 – 2: strong acid pH 3 – 6: weak acid ...