* Hardness is defined by the presence of dissolved calcium and magnesium ions. These minerals are what cause the soap scum, scaling, and other issues associated with hard water.
* NaCl and KCl are soluble salts that don't contribute to these ions. They dissolve into sodium (Na+) and chloride (Cl-), and potassium (K+) and chloride (Cl-) ions, respectively.
What does affect water hardness?
* Calcium (Ca2+) and Magnesium (Mg2+) ions. These are primarily responsible for hard water.
* Bicarbonates (HCO3-) and other anions can also contribute to hardness by forming insoluble salts with calcium and magnesium.
Important Note: While NaCl and KCl don't directly cause hardness, excessive amounts of these salts in water can affect the palatability and can contribute to other water quality issues.
Let me know if you have any other questions!
