Question

Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals
(a) nitrates
(b) carbonates
(c) sulphates.

Answer 1

Comparison of stability and thermal stability sulphate of alkali metals with those of alkaline earth metals

Property	Nitrates Alkali metals	Alkaline earth metals	Alkali metals	Alkaline earth metals	Alkali metals	Alkaline earth metals
Solubility in water	Soluble	Soluble	Soluble except Li2CO3	Insoluble	Soluble	Less soluble
Thermal stability	On heating nitrates alkali metals except LiNO3 forms nitrites with the evolution of oxygen.	On heating form respective oxides NO2 and O2	Except      Li2CO3 they are stable towards heat.	They decompose on heating to form oxides with the evolution of CO2	Thermally stable	Thermally Stable