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Investigation into how the concentration of a metal ion affects the hardness of water.
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Investigation into how the concentration of a metal ion affects the hardness of water Introduction Water that forms a lather with soap is called soft water. Hard water is water that does not form a lather with soap, due to impurities in the water. Hard water is safe to drink, colourless, odourless and tastes exactly the same as soft water. However, it contains chemical impurities e.g. substances other than water. The impurities that cause hardness in water are usually calcium and/or magnesium ions. Table 1. Water Hardness Classification Grains per Gallon Parts per Million Soft O to 3.5 O to 60 Moderate 3.6 to 7 61 to 120 Hard 7.1 to 10.5 121 to 180 Very Hard More than 10.5 More than 180 Tap water is normally obtained from springs and rivers, and the hardness of the water varies according to the types of rocks and soil through which the water has flowed...
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