Unit 5.4: pH scale and pH calculations
Unit 5.4: pH scale and pH calculations
Learning Objectives
Explain the pH scale as a scale of numbers from 0 to 14 used to express the acidity or alkalinity of a solution.
Calculate pH values of strong acids and strong bases.
Define the concept of K
w
as the equilibrium constant for the ionisation of water – the ionic product of water (ionisation constant of water).
Explain the auto-ionisation of water i.e. the reaction of water with itself to form H
3
O
+
ions and OH
–
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