Transcription of Computer 13 Calcium and Water Hardness
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Computer 13 Calcium and Water Hardness
Computer 13 Water Quality with Vernier 13 - 1 Calcium and Water Hardness INTRODUCTION Calcium , Ca2+ Calcium , in the form of the Ca2+ ion, is one of the major inorganic cations, or positive ions, in saltwater and freshwater. It can originate from the dissociation of salts, such as Calcium chloride or Calcium sulfate, in Water . CaCl2(s) Ca2+(aq) + 2 Cl (aq) CaSO4(s) Ca2+(aq) + SO42 (aq) Most Calcium in surface Water comes from streams flowing over limestone, CaCO3, gypsum, CaSO4 2H2O, and other Calcium -containing rocks and minerals.
Computer 13 13 - 2 Water Quality with Vernier Note that 30 mg/L Ca2+ and 75 mg/L calcium hardness as CaCO 3 are equivalent—they are simply two different ways of expressing calcium levels.
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