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Water/Water hardness

QuestionAnswer
1. Chemical formula for water? H2O
2. Passing water through a wire mesh to remove floating debris is called? Screening
3. The 2 chemicals used to test for water are? 1. Cobalt chloride paper 2. Anhydrous copper sulphate
4. Chlorine is added to water to? Kill bacteria
5. Addition of fluorine to prevent tooth decay is called? Fluoridation
6. Expands on freezing? Water is a good solvent Boils at 100, freezes at 0 These are all examples of? Physical properties of water
7. The elements responsible for hardness in water? Calcium and Magnesium
8. Definition of hard water? Water that does not easily form a lather with soap
9. Chemical used to test for water hardness? Soap
10. 2 ways to remove water hardness? Boiling and Ion exchanger
11. The ions that replace calcium ions to remove hardness in an ion exchanger? Sodium ions
12. Water hardness is a problem in these areas? Limestone
13. White deposit that build up on the inside of pipes in hard water areas? Limescale
14. The chemical name for limestone? Calcium carbonate
15. The name of acid rain formed when carbon dioxide dissolves in rainwater? Carbonic acid
Created by: scienceatkcc
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