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Practical Work — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYPractical Work2 Marks
Question
How the temporary and permanent hardness is removed?
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Answer

Temporary hardness can easily be removed by boiling. permanent hardness can be removed by the following methods:-
(i) By the addition of washing soda
(ii) By ion exchange method
(iii) By the use of polyphosphate water softener

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