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Card 6
Front
Hard water in many areas is caused by dissolved Ca+ ions. Give two advantages of living in a hard water area.
Back
Card 7
Front
Hard water can be caused by dissolved calcium hydrogencarbonate. Explain how this type of hardness can be removed by boiling.
Back
Card 8
Front
Give two methods that can be used to remove hardness.
Back
Card 9
Front
The diagram shows how water in some parts of the UK is treated before it reaches people's homes. Describe stage Z in the process.
Back
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