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Explain the role of lime and washing sod...

Explain the role of lime and washing soda for the removal of permanent hardness of water.

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(i) chemical composition of lime and washing soda
(ii) reasons for the permanent hardness of water
(iii) reaction between components of permanent hard water and lime
(iv) reaction between components of permanent hard water and washing soda
(v) solubility of the products obtained in the above reactions
(vi) relation between the solubility of the products and hardness of water
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Knowledge Check

  • Which of the following is used for removing permanent hardness of water?

    A
    Baking soda
    B
    Washing soda
    C
    Lime
    D
    Bleaching powder

  • Which of the following is used for removing permanent hardness of water?

    A
    Lime
    B
    Washing soda
    C
    Bleaching powder
    D
    Baking soda

  • The reagent which is not used for removing the permanent hardness of water is :

    A
    washing soda
    B
    sodium hexametaphophate
    C
    Glauber's salt
    D
    hydrated sodium aluminium silicate ( zeolite )

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    Answer the following : Give the formula of Zeolite used in ion exchange method to remove permanent hardness of water.

    In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

    Hard water contains dissolved salts such as magnesium and calcium chlorides, bicarbonates, or sulphates. There are two kinds of hardness of water, i.e. temporary hardness and permanent hardness. When Graham's salt (calgon) is used for removal of permanent hardness of water, Ca^(2+) and Mg^(2+) are sequestered in the form of

    Which of the following methods is not used to remove permanent hardness of water?

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