Cobalt(II) chloride, a blue solid, can absorb water from the...

Cobalt(II) chloride, a blue solid, can absorb water from the air to form cobalt(II) chloride hexahydrate, a pink solid. The equilibrium is so sensitive to moisture in the air that $\mathrm{CoCl}_{2}$ is used as a humidity indicator. (a) Write a balanced equation for the equilibrium. Be sure to include water as a reactant to produce the hexahydrate. (b) How many grams of water are released by the decomposition of $2.50 \mathrm{~g}$ of cobalt(II) chloride hexahydrate?

Cobalt(II) chloride, a blue solid, can absorb water from the air to form cobalt(II) chloride hexahydrate, a pink solid. The equilibrium is so sensitive to moisture in the air that $\mathrm{CoCl}_{2}$ is used as a humidity indicator.
(a) Write a balanced equation for the equilibrium. Be sure to include water as a reactant to produce the hexahydrate.
(b) How many grams of water are released by the decomposition of $2.50 \mathrm{~g}$ of cobalt(II) chloride hexahydrate?

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Key Concepts

Stoichiometry and Molar Conversions

Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. Understanding stoichiometry involves the use of mole ratios, molar masses, and conversion factors to calculate the amounts of substances involved, whether converting between grams and moles or determining yields in a reaction.

Hydration Equilibrium

Hydration equilibrium refers to the reversible process in which a salt absorbs water molecules from its surroundings to form a hydrate, and conversely, a hydrate releases water to revert to its anhydrous form. This concept is critical in understanding how compounds interact with moisture, particularly in applications like humidity indicators.

Balanced Chemical Equations

Writing balanced chemical equations is essential for representing chemical reactions accurately. It involves ensuring that the number of atoms of each element is conserved, which allows the prediction of the correct stoichiometric relationships between reactants and products in a reaction.

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