Hard Water
- Created by: Lizzi
- Created on: 17-05-13 11:43
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- Hard Water
- Made hard by dissolved compunds (eg: Ca, Mg)
- they react with soap to form scum
- temp. hard water can produce solid scale when heated (reduces appliance's efficiency)
- hard water maintains teeth/bone health and prevents heart disease
- Can be softened by removing salts that form scum and scale
- temp. hardness removed by heating
- hydrogencarbonate ions in temp. water decompose when heated. Carbonate ions react with Ca2+ and Mg2+ to make precipitates
- both types of hard water can be softened by adding washing soda or using ion exchange resin
- water for drinking should contain only low levels of dissolved substances and microbes
- water is treated by filtering and adding chlorine (to kill microbes)
- we can make pure water by distillation- but requires lots of energy and is expensive
- Made hard by dissolved compunds (eg: Ca, Mg)
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