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Lime water in aqueous solution gives whi...

Lime water in aqueous solution gives white precipitate by passing carbondioxide, but the precipatate dissolves in excess carbondioxide. Why? 

Text Solution

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Lime water gives insoluble calcium carbonate with carbondioxide
`Ca(OH)_(2)+CO_(2)rarr CaCO_(3)darr+H_(2)O`
 Calcium carbonate is soluble in water in the presence of carbondioxide, giving calcium bicarbonate `CaCO_(3)+H_(2)O+CO_(2)rarrCa(HCO_(3))_(2)`
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Lime water in qaueous solution gives white precipitate by passing carbondioxide ,but the precipatate dissolves in excess carbondioxide .Why ?

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Knowledge Check

  • An aqueous solution of silver nitrate gives a white precipitate with

    A
    `C_2 H_5Cl`
    B
    `CHCl_3`
    C
    `HCl`
    D
    None of the above

  • Au aqueous solution of silver nitrate gives a white precipitate with

    A
    `C_(2)H_(5)CI`
    B
    `CHCI_(3)`
    C
    `HCI`
    D
    `"CCI"_(4)`

  • (i) A white solid A, on being strongly heated, leaves a residue which is yellow while hot and white hot and white when cold ii) The solid A, insoluble in water, dissolves in dilute HCI to give a solution B and a gas which does nor affect acidified dichromate paper but turns baryta water milky. iii) When H_(2)S is passed through the solution B, a white precipitate C is obtained iv) The precipitate C dissolves in dilute HCI to give a solution which, when treated with an NaOH solution, gives a white precipitate. The final precipitate dissolves in an excess of NaoH form a solution D. This alkaline solution, on acidification with acetic acid followed by treatment with H_(2)S , gives the precipitate C. The salt A is a

    A
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    B
    carbonate
    C
    sulphide
    D
    chloride

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