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What is temporary hardness of water? How...

What is temporary hardness of water? How is it removed?

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Temporary hardness of water is due to the presence of soluble bicarbonates of magnesium and calcium. By heating / boiling, these salts decomposed into insoluble carbonate and hydroxide, respectively. The resulting precipitates can be removed by filtration. `Ca(HCO_(3))_(2)_(aq)toCaCO_(3(s))+H_(2)O_((l))+CO_(2(g))`
`Mg(HCO_(3))_(2)_(aq)toMg(OH)_(2(s))+CO_(2(g))`
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Knowledge Check

  • Hardness of water cannot be removed by

    A
    Treatment with washing soda
    B
    adding calgon
    C
    boiling
    D
    addition of chlorine

  • Which of the following causes temporary hardness of water?

    A
    `MgCI_(2)`
    B
    `Na_(2)SO_(4)`
    C
    `Mg(HCO_(3))_(2)`
    D
    NaCI

  • The reagent used for softening of the temporary hardness of water is // are : (i) Ca_(3) ( PO_(4))_(2) (ii) Ca(OH)_(2) (iii) Na_(2) CO_(3) (iv) NaOCl

    A
    II and III
    B
    I and III
    C
    II and IV
    D
    I and IV

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