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Chemical (X) is used for water softening...

Chemical `(X)` is used for water softening to remove temporary hardness. `(X)` reacts with sodium carbonate to generate caustic soda. When `CO_(2)` is bubbled through `(X)`?

Text Solution

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`Ca(OH)_(2)` is used for water softening to remove temporary hardness.
`underset((X))(Ca(OH)_(2))+CaHCO_(3)rarr2CaCO_(3)darr+2H_(2)O`
`Ca(OH)_(2)+Na_(2)CO_(3)rarrunderset("or caustic soda")underset("Sodium hydroxide")(2NaOH+caCO_(3))`
`Ca(OH)_(2)+CO_(2)rarrunderset("Milkiness")(CaCO_(3)darr+H_(2)O`
Hence, `(XX)` is `Ca(OH)_(2)`.
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Knowledge Check

  • Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO_(2) is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A?

    A
    `CaCO_(3)`
    B
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    C
    `Ca(OH)_(2)`
    D
    `Ca(HCO_(3))_(2)`

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    A
    `CaCO_(3)`
    B
    CaO
    C
    `Ca(OH)_(2)`
    D
    `Ca(HCO_(3))_(2)`.

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    B
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