The pH
scale is a way of describing how acid or
alkaline a substance is.
1 molar hydrochloric
acid has a H+aq concentration of 1 (100)
mol/l.
Its pH is 0.
Very pure water
has a H+aq concentration of 10-7)
mol/l.
Its pH is 7.
1 molare Sodium hydroxide
solution has a H+aq concentration of 1 (10-14)
mol/l. Its pH is 14.