Interpretation:
The use of given hydrate as a means of roughly determining the probability of rain needs to be explained.
Concept introduction:
On the basis of bonding, chemical compounds can be classified as ionic and covalent compounds.
Ionic compounds are composed of oppositely charged ions whereas covalent compounds are composed by equal sharing of electrons between bonded atoms.

Answer to Problem 82SSC
When it is heated, it turns to blue. It proves that the color of dehydrate compound is different from the hydrate salt. It can be used to detect the probability of rain because moisture will turn dehydrate blue color compound to pink hydrate compound.
Explanation of Solution
Hydrate compounds are the chemical compounds in which ionic compound is associated with number of water molecules. The water molecules are associated with each formula unit.
The name of hydrate is the name of the ionic compound with prefix of number of water molecules and followed by hydrate term.
The color of given cobalt (II) chloride hexa-hydrate is pink. When it is heated, it turns to blue. It proves that the color of dehydrate compound is different from the hydrate salt. It can be used to detect the probability of rain because moisture will turn dehydrate blue color compound to pink hydrate compound.
When it is heated, it turns to blue. It proves that the color of dehydrate compound is different from the hydrate salt. It can be used to detect the probability of rain because moisture will turn dehydrate blue color compound to pink hydrate compound.
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