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Compare the Solubility and Thermal Stability of the Following Compounds of the Alkali Metals with Those of the Alkaline Earth Metals Sulphates - Chemistry

Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals

Sulphates

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Solution 1

Sulphates

Thermal stability

Sulphates of both group 1 and group 2 metals are stable towards heat.

Solubility

Sulphates of alkali metals are soluble in water. However, sulphates of alkaline earth metals show varied trends.

BeSO4 Fairly soluble

MgSO4 Soluble

CaSO4 Sparingly soluble

SrSO4 Insoluble

BaSO4 Insoluble

In other words, while moving down the alkaline earth metals, the solubility of their sulphates decreases.

Solution 2

Sulphates of group 1 are soluble in water except Li2SO4. They are thermally stable.
Solubility of sulphates of group 2 decreases down the group because Lattice energy dominates over hydration energy.

Sulphates of group 2 elements are thermally stable and increasing down the group due to increases in Lattice energy.

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APPEARS IN

NCERT Class 11 Chemistry Textbook
Chapter 10 The s-Block Elements
Q 15.3 | Page 306
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