Chapter Name : Hydrogen |
Sub Topic Code : 102_11_09_06_05 |
Topic Name : Water |
|
Sub Topic Name : Hard And Soft Water |
• Water may be classified as hard water and soft water depending on the presence of salt. • Hard water contains calcium and magnesium salts in the form of hydrogencarbonate, chloride and sulphate. It thus forms a scum with soap. • Soft water is free from any soluble salts of calcium or magnesium and thus forms lather with soap.
Chemical properties of Water.
When detergent is added to Epsom salt plus water, you see that very few bubbles are formed. This is because Epsom salt makes the water hard.
Why water is sometimes called as hard water?
Key Words | Definitions (pref. in our own words) |
---|---|
Hard water | Water that contains calcium and magnesium salts in the form of hydrogencarbonate, chloride and sulphate is called as hard water. |
Soft water | Water free from soluble salts of calcium and magnesium is called soft water. |
Gadgets | How it can be used |
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Epsom salt | Add epsom salt to a cup of distilled water. |
Detergent | Add detergent to this cup of epsom salt plus water. |
- It is important to know whether water is hard or not, as use of hard water can damage clothes, boilers and affect humans as well.
Home.
Examples | Explainations |
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Well | Sometimes water from wells may be hard due to salt contamination. |
Hardness of water.
Properties of hard and soft water.
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