The pH scale

How acidic or alkaline a substance is (the pH of the substance) can be measured using the pH scale, a continuous range that stretches from below 0 to above 14. Most common pH values occur between 0 and 14.

Acids have a pH of less than 7.

Alkalis have a pH more than 7.

Water and neutral solutions have a pH of exactly 7.

A pH scale. Acids are numbered 0 to 6 and go from red to green in colour. 0 is the most acidic with 6 being the least. Neutral is in the middle has the number 7 and is dark green. Alkalis range from 8 to 14 going from a light green to dark purple. 8 is the least alkalic with 14 being the most.The pH scale