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Explain Hardness - Water Softening
1) Hardness is used to characterize a water that does not lather well, causes a scum in the bath tub and leaves hard, white, crusty deposits when water is heated
2) Calcium or magnesium forms soap- Ca or Mg complex and prevents soap from interacting with dirt
3) Hardness- caused mainly by Calcium and Magnesium(actually all polyvalent ions)
4) Common units are meq/l or mg/l as CaCO3
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