Water types

1. formed when carbon dioxide in the atmosphere reacts with water
4. one method used to remove permanent hardness
6. This type of water can be changed when boiled
8. This type of water does not readily lather when mixed with soap
11. these ions replace calcium and magnesium when hard water is softened
14. formed when calcium hydrogencarbonate is broken down and a precipitate is formed
15. This is insoluble in water but will react with acidic rain water to make temporary hard water
16. water that does not contain calcium or magnesium ions
17. Hard water is good for keeping these strong

2. temporary hardness can be removed from water by doing this
3. The soluble product formed when aid rain reacts with chalk or limestone
5. a soluble carbonate found in washing soda, used to remove permanent hardness
7. Hard water helps reduce this health problem
9. formed when hard water reacts with soap
10. temporary hard water can reduce this of this such as kettles
12. If compounds containing this ion are dissolved in water the water will be 'hard'
13. These ions are just one example of ions that are responsible for making water hard