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deeksha sharma Grade: 11
        

why hardness of water is caused by salts of calcium and magnesium only and not by sodium or potassium salts?

7 years ago

Answers : (2)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear deeksha,


Hardness of water is usually attributed to calcium and magnesium salts but any cation with two or more charges can cause it (eg iron(II) here). The cation will form a precipitate (scum) with soap, eg:


calcium chloride + sodium stearate (soap) → calcium stearate (scum) + sodium chloride


This scum wastes soap and can cause abrasion to clothes, as well as causing unsightly deposits round baths and showers.


Please feel free to post as many doubts on our discussion forum as you can.

We are all IITians and here to help you in your IIT JEE preparation.

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7 years ago
kedar joshi
35 Points
										

hi


assume calcium carbonate to be present in the water .


when this water is treated with soap


calcium carbonate+sodium oliate(soap)-->sodiumcarbonate +calcium oliate


this calium oliate forms insoluble scum but sodium carbonate doesnot.

6 years ago
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