Hardness of Water

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Across
  1. 1. Calcium hydrogencarbonate -> Calcium Carbonate + Carbon Dioxide + _______.
  2. 4. Water that contains little or no hardness.
  3. 7. Calcium Carbonate is _______.
  4. 9. Calcium Hydrogencarbonate is ______.
  5. 11. Carbon Dioxide + Rainwater -> ______ acid.
Down
  1. 2. Rain water is slightly ______.
  2. 3. Hardness is caused by magnesium and _______ ions.
  3. 5. Calcium carbonate is commonly known as chalk, marble, or ________.
  4. 6. Temporary hardness can be removed by ________.
  5. 8. Magnesium ______ dissolves in water better than calcium ______.
  6. 10. Hard water makes _______.
  7. 12. Hardness is removed by ion exchange ______.