It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).
A 33.22 gram sample of a hydrate of LICI was heated thoroughly in a porcelain crucible, until its weight remained
constant. After heating, 23.31 grams of the anhydrous compound remained. What is the formula of the hydrate?

Heating a hydrate leads to an endothermic reaction that produces a residue known as the anhydrous compound which is different in structure, texture and even color in some cases, from its parent hydrate.

Thus, 23.31 grams of the anhydrous compound remained, when A 33.22 gram sample of a hydrate of LICI was heated thoroughly in a porcelain crucible,

The formula so obtained will be LiCl which got converted from its parent hydrated state that is LiCl. H₂O.

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