S block elements

  • 0_1546449663166_IMG_20190102_225022.jpg
    Ans=(4)..But size increases down group..Cs is largest of all it it should have lowest hydration then why it is most soluble ..Pls explain

  • @sri
    There is some reason and factors to determine the solubilities of alkali metals.

    When dissolving, the ionic crystal’s lattice enthalpy must be broken while at the same time the hydration shell is generated around the cations and anions. The latter process is typically exergonic while the former is strongly endergonic.

    How well a salt dissolves depends not only on the strength of solvation but also on the strength of the crystal lattice. If the lattice is strong, the solubility will be lower because there is an increased tendency to reform the crystal lattice.

    Moreover, it is an experimental fact. So you have to remember the order.

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