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the hardness of a water sample (in ter...

the hardness of a water sample (in terms of Equivalents of `CaCO_(3)`) containing `10^(-3)MCaSO_(4)` Is :
(Molar mass of `CaSO_(4)=1365h mol^(-1)`)

Text Solution

Verified by Experts

`10^(-3) M CaSO_4 ` means `-=10^(-10) M CaCO_3`
`10^(-3) M CaCO_3 ` means `10^(-3)` mol or `10^(-3) xx 100` i.e.
100 mg of `CaCO_3` are present in 1 L
Hardness of water = Number of mg of `CaCO_3`present per L solution = 100 ppm.
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A water is said to be soft water if it produces sufficient foam with the soap and water that does not produce foam with soap is known as hard water. Hardness has been classified into two types (i)Temporary hardness (ii) Permanent hardness. Temporary hardness is due to presence of calcium and magnesium bicarbonate. It is simply removed by boiling as Ca(HCO_(3))_(2)overset(Delta)rarr CaCO_(3)darr+CO_(2)uarr+H_(2)O Mg(HCO_(3))_(2)overset(Delta)rarr MgCO_(3)darr+CO_(2)uarr+H_(2)O temporary hardness can also be removed by addition of slaked lime, Ca(OH)_(2) Ca(HCO_(3))_(2)+Ca(OH)_(2) to 2CaCO_(3)darr+2H_(2)O permanent hardsness is due to presencce of sulphates and chlorides of Ca,Mg,etc. It is removed by washing soda as CaCl_(2)+Na_(2)CO_(3) to CaCO_(3)darr+2NaCl CaSO(4)+Na_(2)CO_(3)to CaCO_(3)darr+Na_(2)SO_(4) Permanent hardness also removed by ion exchange resin process as 2RH+Ca^(2+)toR_(2)Ca+2H^(+) 2ROH+SO_(4)^(2-) to R_(2)SO_(4)+2OH^(-) The degree of hardness of water is measured in terms of PPm of CaCO_(3) 100 PPm means 100 g of CaCO_(3) is present in 10^(6) g of H_(2)O . If any other water sample which contain 120 PPm of MgSO_(4) , hardness in terms of CaCO_(3) is equal to =100 PPm. One litre of a sample of hard water (d=1 g/mL) cotains 136 mg of CaSO_(4) and 190 mg of MgCl_(2) . What is the total hardness of water in terms of CaCO_(3) ?

MODERN PUBLICATION-HYDROGEN-Competition file (Objective Questions) (Multiple Choice Questions from Competitive Examinations)
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  13. The temporary hardness of water is due to :

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  15. The hydride that is NOT electron deficient is :

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  16. NaH is an example of :

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  17. The chemical nature of hydrogen peroxide is :

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  18. Amongst H2O, H2S, H2 Se and H2 Te, the one with the highest boiling po...

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