1.What is water? (2)2.Define hardness of water. Is the sea water hard? Explain (4)3. What are the salts responsible for carbonate and non-carbonate hardness of water?(2)4.Name a chemical that can be used in a laboratory to test for the presence of water (2)5.What colour change is noticed in this test for water?(2)6.Some elements form compounds that dissolve in water to cause hardness. Name an element whose compounds dissolve in water to cause hardness(2)7.How can hardness be removed from water. Motivate your answer with a diagram (5)8.An analysis of drinking water showed that it contains 0.02 grams of chlorite per 700mL of water. Does this exceed the EPA drinking water standard?(5) 9.How did this chemical contaminant enter the drinking water? (6)

1.What is water? (2)2.Define hardness of water. Is the sea water hard? Explain (4)3. What are the salts responsible for carbonate and non-carbonate hardness of water?(2)4.Name a chemical that can be used in a laboratory to test for the presence of water (2)5.What colour change is noticed in this test for water?(2)6.Some elements form compounds that dissolve in water to cause hardness. Name an element whose compounds dissolve in water to cause hardness(2)7.How can hardness be removed from water. Motivate your answer with a diagram (5)8.An analysis of drinking water showed that it contains 0.02 grams of chlorite per 700mL of water. Does this exceed the EPA drinking water standard?(5) 9.How did this chemical contaminant enter the drinking water? (6)

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds

Section: Chapter Questions

Problem 114QRT

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