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A sample of water has a hardness express...

A sample of water has a hardness expressed as 80 ppm of `Ca^(2+)`.This sample is passed through an ion exchange column and the `Ca^(2+)` is replaced by `H^+` What is the pH of the water after it has been so treated ? [Atomic mass of Ca=40]

A

3

B

2.7

C

5.4

D

2.4

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The correct Answer is:
d
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A water is said to be soft water if it produces sufficient foam with the soap and waterthat 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)to2CaCO_(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)toCaCO_(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-)toR_(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. A 200 g sample of hard water is passed through the column of cation exchange resin, in which H^(+) is exchanged by Ca^(2+) .The outlet water of column required 50mL of 0.1 M NaOH for complete neutralization.What is the hardness of Ca^(2+) ion in PPm?

When electricity is passed through H_(2)SO_(4) and CaCl_(2) solution , the ratio of mass of hydrogen and calcium liberated will be________. (Atomic mass of Ca = 40)

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GRB PUBLICATION-IONIC EQUILIBRIUM-All Questions
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  2. The following equilibrium is established when hydrogen chloride is dis...

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  3. In the following reaction HC2O4^(-) (aq)+PO4^(3-) (aq) hArr HPO4^(2-)...

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  4. According to Bronsted Lowry concept, in given reaction, water will beh...

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  5. Species acting as both Bronsted acid and base is:

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  6. The conjugate base of H2PO4^(-) is :

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  7. The conjugate base of OH^(-) is :

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  8. Three reactions involving H2PO4^- are given below : (P)H3PO4+H2O to ...

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  9. Which of the following correctly explains the nature of boric acid in ...

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  10. In water, the acid HCIO(4), HCI, H(2)SO(4) and HNO(3) exhibit the same...

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  11. Which of the following is the strongest base ?

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  12. An acid with molecular formula C7H6O3 froms only three types of sodium...

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  13. Which of the following is a weak electrolyte in aqueous solution ?

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  14. H2CO3(aq)+H2O(l)toHCO3^-(aq) + H3O^+(aq) HCO3^(-)(aq) + H2O(l)to CO3...

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  15. Weak acid include which of the following ? (P)HF(aq) , (Q)HI(aq) , (...

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  16. Which is not a conjugate acid/base pair ?

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  17. What is the conjugate base of HSO4^- ?

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  18. When the acids, HCIO3, H3BO3, H3PO4 , are arranged in order of increas...

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  19. Which acid is the strongest ?

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  20. What is the conjugate acid of HPO4^(2-)?

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  21. Species acting as both Bronsted acid and base is:

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