What do you understand by
(a) Soft water
(b) Hard water
(c) Temporary Hard water (d) Permanent hard water.
Answers
a) Soft water is surface water that contains low concentrations of ions and in particular is low in ions of calcium and magnesium. Soft water naturally occurs where rainfall and the drainage basin of rivers are formed of hard, impervious and calcium-poor rocks.
b)Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates
c)Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). The presence of the metal cations makes the water hard.
d)Permanent Hardness of Water:
When the soluble salts of magnesium and calcium are present in the form of chlorides and sulfides in water, we call it permanent hardness because this hardness cannot be removed by boiling. We can remove this hardness by treating the water with washing soda.
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Answer:
(a)Soft water- Water is said to be soft, if it readily forms lather with soap.
(b) Hard water- Water is said to be hard when it does not readily forms lather with soap.
(c) Temporary Hard Water- Water contains only hydrogen carbonates of calcium and magnesium is called temporary hard water.
(d) Permanent Hard Water- Water containing sulphates and chloride of magnesium and calcium is called permanent hard water.
Explanation:
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