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water that has run over chalk and still has these types of particles in. When mixed with soap solution forms a scum. However, soft water when mixed with soap solution forms a precipitate.
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Water containing some soluble hydrocarbonates of calcium and magnesium as Ca(HCO3)2 and Mg(HCO3)2 - temporary hard water
or
Water containing another salts of calcium and magnesium (as chlorides, sulfates, nitates) - permanent hard water
Total hardness is the sum of temporary and permanent.
Josefina Kunze
Wiki User
∙ 10y agoThe hardness of material is defined as its resistance to another material penetrating its surface, and is related to its near resistance and strength.
or
Hardness is the property of material that enables it to resist plastic deformation, usually by penetration. However, the term hardness may also refer to resistance to bending, scratching, abrasion or cutting.
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