Contains sodium. These ions are exchanged for magnesium and calcium ions as the water passes through the column. Softens temporary, and permanently hard water.
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What does boiling do?
Removes temporary hard water.
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Describe water treatment.
Metal screen removes twigs and large items. Settlement tank lets sand and soil settle out. Aluminium sulfate and lime cause sedimentation. Special sand filter removes remaining unwanted particles. Then, chlorine kills bacteria.
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Describe a jug/filter.
Carbon reduces levels of chlorine, pesticides and other impurities. Ion-exchange removes calcium, magnesium, lead, copper and aluminium. Silver discourages bacteria growth in the filter.
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What method purifies water.
Distillation.
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Descibe ionic/covalent compounds solubility in water.
Ionic compounds are soluble in water. Covalent compounds are insoluble in water.
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A saturated solution contains the maximum amount of solute that will dissolve at that temperature.
Chlorine may be added to drinking water to reduce microbes and fluoride may be added to improve dental health.
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If the pressure is increased and the temperature is kept constant the solubility increases.
If the temperature is increased and the pressure is kept constant the solubility decreases.
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If both temperature and pressure are increasedthen the solubilty increases.
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