Balancing Chemical Equations Video Lessons

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Concept: Balancing Chemical Reactions

Problem: Write a balanced chemical equation for the following and classify the reaction. Mercury(II) nitrate solution reacts with potassium iodide solution to give a mercury(II) iodide precipitate and potassium nitrate solution. 

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:

Mercury(II) Nitrate

• Mercury(II) is the metal mercury (Hg) with a (+2) charge indicated by the Roman numeral → Hg2+

• Nitrate is the anion NO3-

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

          • Hg2+ will have a subscript of 1 from NO3- → Hg

          • NO3 will have a subscript of 2 from Hg2+ → (NO3)2

          • Subscript 1 is no longer indicated → Hg(NO3)2(aq)

Recall: All nitrates are soluble


Potassium iodide

• Potassium is a metal K. In forms ionic bond as K+

• Iodide is the anionic form of iodine → I-

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

          • K+ will have a subscript of 1 from I- → K

          • I- will have a subscript of 1 from K+ → I

          • Subscript 1 is no longer indicated → KI(aq)

Recall: K is from group 1A. Group 1A salts are soluble.


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Problem Details

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

Mercury(II) nitrate solution reacts with potassium iodide solution to give a mercury(II) iodide precipitate and potassium nitrate solution. 

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