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(a) Why does the solubility of alkaline ...

(a) Why does the solubility of alkaline earth metal hydroxides in water increase down the group.
(b). Why does the solubility of alkaline earth metal carbonates and sulphates in water decrease doewn the group?

Text Solution

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a. Among alkaline earth metal hydroxides, the anion being common, the cationic radius will influence the lattice enthalpy.Since lattice enthalpy decreases much more than the hydration enthalpy with increasing ionic size, the solubility increases down the group `(darr)`.
b. The size of anions being much larger as compared to cations, the lattice enthalpy will remain almost constant within a particular group. Since the hydration enthalpy decreases down the group, solubility will decreases as found for alkaline earth metal carbonates and sulphates.
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Knowledge Check

  • Solubility of alkaline earth metal carbonates in water is as follows:

    A
    `BeCO_(3)gt MgCO_(3) gt CaCO_(3)gt BaCO_(3)`
    B
    `BeCO_(3) gt CaCO_(3) gt MgCO_(3) lt BaCO_(3)`
    C
    `BeCO_(3) lt MgCO_(3) lt CaCO_(3) lt BaCO_(3)`
    D
    `BaCO_(3) lt BeCO_(3) lt MgCO_(3) lt CaCO_(3)`

  • The solubility of sulphates of alkaline earth metals in water decreases down the group because

    A
    The lattice energy of sulphates of group II decreases down the group
    B
    The lattice energy of sulphates of group II increases down the group
    C
    Both hydration and lattice energies decreases down the group
    D
    The decrease in hydration energy is more than the decreases in lattice energy

  • Solubility of alkaline earth metal sulphates decreases down the group 2 because

    A
    they become more ionic
    B
    lattica energy of sulphates does not vary siginifacantly
    C
    hydration energy decreases rapidly from `Be^(2+)` to `Ba^(2+)`
    D
    latica energy plays more predominant role than hydration energy

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    The correct order of the solubility of alkaline- earth metal sulphates in water is :

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