MT 73.1 Total Hardness of Water
Content Handbook O
Outline of method
The total hardness of water is determined by titration of alkaline earth ions in water with chelating agent using colorimetric end point determination. Commercially available reagents are used.
The method is suitable to determining the total hardness of water. Ca2+ and Mg2+ are expressed as their contribution to the total hardness in terms of calcium carbonate and not as their individual ionic contributions.