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Air sample from an industrial town, heav...

Air sample from an industrial town, heavily polluted by `CO_(2)` was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where `CO_(2)(g)` was absorbed completely . 25 mL of the above solution was then treated with excess of `BaCl_(2)` solution where all the carbonate was precipitated as `BaCo_(3)(s)` . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization.
ppm strenght of `CO_(2)(g)` , volume by volume i.e. , mL of `CO_(2)` per `10^(6)` mL of air was :

A

560

B

5600

C

100

D

1000

Text Solution

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The correct Answer is:
D
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0.50 g of a mixture of K_(2)CO_(3) and Li_(2)CO_(3) required 30 mL of 0.25 N HCl solution for neutralization. What is % composition of mixure?

Air sample from an industrial area of Delhi, which is heavily polluted by CO_(2) , was collected and analysed. One such sample of 224 L of air measured at STP was passed through a 500 " mL of " 0.1 M KOH solution, where CO_(2)(g) was absorbed completely. 50 " mL of " the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCO_(4)(s) . The solution was filtered off and the filtrate required 30 " mL of " 0.1 M HCl solution for neutralisation. Q. Calculate the weight of the precipitate of BaCO_(3)(s) obtained from 50 " mL of " the above test solution. (Ba=137,C=12,O=16,Mw(BaCO_(3))=137+12+3xx16=197gmol^(-1))

Knowledge Check

  • Air sample from an industrial town, heavily polluted by CO_(2) was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where CO_(2)(g) was absorbed completely . 25 mL of the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCo_(3)(s) . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization. Fraction of original NaOH (by mole) that reached with CO_(2) was:

    A
    0.2
    B
    0.4
    C
    0.6
    D
    0.8

  • Air sample from an industrial town, heavily polluted by CO_(2) was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where CO_(2)(g) was absorbed completely . 25 mL of the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCo_(3)(s) . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization. Weight (in milligrams ) of precipitate BaCO_(3)(s) obtained from the 25 ml of test solution was: [Atomic weight :Ba =137, C=12, O=16]

    A
    27.58
    B
    275.8
    C
    492.5
    D
    49.25

  • Air sample from an industrial area of Delhi, which is heavily polluted by CO_(2) , was collected and analysed. One such sample of 224 L of air measured at STP was passed through a 500 " mL of " 0.1 M KOH solution, where CO_(2)(g) was absorbed completely. 50 " mL of " the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCO_(4)(s) . The solution was filtered off and the filtrate required 30 " mL of " 0.1 M HCl solution for neutralisation. Q. ppm strength of CO_(2)(g) volume by volume (" mL of " CO_(2) per 10^(6) L of air) is

    A
    224
    B
    2240
    C
    100
    D
    1000

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    IF 250 mL of 0.25 M NaCl solution is diluted with water to a volume of 500 mL , the new concentration of the solution is ______.

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    If above gaseous mixture at 273K is passed through KOH solution , contraction in volume (in litre) will be (assume KOH solution absorb CO_(2) gas completely):

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