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When 9.45g of ClCH2COOH is added to 500ml. of water, its freezing point drops by 0.5°C. The dissociation constant of ClCH2 COOH is x × 10-3. The value of x is__________ (Rounded off to the nearest integer)

    [ k f ( H 2 O ) = 1 . 8 6 K   k g   m o l − 1 ]         

0 2 Views | Posted 4 weeks ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    4 weeks ago

    Δ T f = 0 . 5 ° C

    Kf = 1.86

    Using, density of water = 1g / mL

    i = ?

    Δ T f = i k f . m           

    0 . 5 = i × 1 . 8 6 × 9 . 4 5 9 4 . 5 × 5 0 0 × 1 0 0 0          

    i = 1.344

    Now, using α = i − 1 n − 1  

    n for ClCH2COOH = 2

     a =   1 . 3 4 4 − 1 2 − 1 = 0 . 3 4 4

    Using

      K a = C α 2 1 − α           

    K a = 0 . 2 × ( 0 . 3 4 4 ) 3 0 . 6 6 = 3 6 × 1 0 − 3           

               So; x = 36

              

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A 0.5 percent solution of potassium choride was found to freeze at -0.24°C. The percentage dissociation of potassium chloride is__________. (Nearest integer)

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0.5 % KCl solution has molality (m) = 0 . 5 × 1 0 0 0 7 4 . 5 × 9 9 . 5  

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