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Assertion (A) Calgon is used for removin...

Assertion (A) Calgon is used for removing `CA^(2+) and Mg^(2+)` ions from hard water.
Reason (R ) Calgon forms precipitates with `Ca^(2+) and Mg^(2+)`

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true but R is not a correct explanation of A

C

A is true but R is fales

D

Both A and R are fales.

Text Solution

Verified by Experts

The correct Answer is:
D
Both assertion (A) and reason ( R) are not true.
Correct Assertion : Calgon mask the properties of `Ca^(2+)` and `Mg^(2+)` ions present in water without removing them as ppt.
Correct Reason. Calgon forms soluble complexes with `Ca^(2+)` and `Mg^(2+)` in which properties of these ions are masked.
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Assertion : Calgon is used in manufacture of soft water being used for laundry purpose. Reason : Ca^(2+) and Mg^(2+) ions present in hard water are rendered ineffective by calgon forming their soluble complexes.

A 50 mL sample of hard water containing Ca^(2+) and Mg^(2+) ions is titrated with 50 mL. 0.005 M EDTA solution at pH=10 , using eriochrome balck -T indicator to reach equivalence point. In a equal amount of hard water sample, Mg^(2+) ions are precipated as Mg(OH)_(2) by adding suitable amount of NaOH . the solution, after precipation of Mg(OH)_(2) , is strired and then titrated with EDTA solution using calcon as indicator, and it requires 10 mL of above EDTA solution to reach equivalence point. a. Calculate the strength of Ca^(2+) and Mg^(2+) ions present in hard water. b. Calculate the hardness due to Ca^(2+) ions in p p m of CaCO_(3) . c. Calculate the hardnesss due to Mg^(2+) ions in p p m of CaCO_(3) . d. Calculate the total hardness of water in p p m of CaCO_(3) .

Name the compound used for measuring the hardness of water, i.e., for estimation of Ca^(2+) and Mg^(2+) ions.