Problem: Write a balanced chemical equation for the following and classify the reaction. Heating solid nickel chloride dihydrate yields solid nickel chloride and water vapor. 

FREE Expert Solution

Before balancing the chemical reaction, let’s first write the chemical formula of each of the compounds involved in the reaction.


Reactants:

Nickel Chloride Dihydrate

• Nickel is a metal. Its most common oxidation state is +2 → Ni2+

• Chloride is the anionic form of chloride from group 7A → Cl-

When ions combine, their charges or oxidation numbers crisscross to become subscripts

          • Ni2+ will have a subscript of 1 from Cl- → Ni

          • Cl- will have a subscript of 2 from Ni2+ → Cl2

          • Subscript 1 is no longer indicated → NiCl2

• dihydrate indicates that the nickel chloride has two (‘di) molecules of water of crystallization → NiCl2(s)H2O


Heat

• Heat has no chemical formula.

• It is used to drive the reaction forward.

• Since the reaction consumes heat to proceed, the reaction is endothermic.


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Problem Details

Write a balanced chemical equation for the following and classify the reaction. 

Heating solid nickel chloride dihydrate yields solid nickel chloride and water vapor.