Hard Water

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Across
  1. 1. What is formed when soap reacts with the calcium ions in hard water
  2. 4. A method of removing hardness involving swapping calcium ions for sodium ions.
  3. 6. The main ion in hard water
  4. 7. The type of acid formed when carbon dioxide dissolves in rain water
  5. 8. A way of purifying water involving evaporating it then condensing it.
  6. 10. The anion in the compound that causes temporary hardness
  7. 12. Hard water is water that does not ______ easily with soap
  8. 13. Hydrated sodium carbonate, added to hard water to remove calcium ions
  9. 15. The type of rock that leads to hard water formation
  10. 16. What you see if you add put some acid on limescale due to carbon dioxide being formed.
Down
  1. 2. The main compound in limestone and limescale
  2. 3. What cations are exchanged for in a mixed bed resin
  3. 5. This is formed in water pipes and kettles from hard water.
  4. 9. Hard water is good for this process (think beer).
  5. 10. What anions are exchanged for in a mixed bed resin.
  6. 11. Doing this removes temporary hardness but not permanent hardness
  7. 14. The anion in a compound that causes permanent hardness