Balancing Chemical Equations Video Lessons

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Concept: Balancing Chemical Reactions

Problem: What is the chemical equation for potassium oxide + water → potassium hydroxide?

FREE Expert Solution

We are asked to write the chemical equation of the reaction, let’s first write the chemical formula of each of the compounds involved in the reaction.


Reactants:

Potassium Oxide

• Potassium is a metal from group 1A. It forms ionic compounds as K+

• Oxide is the anion form of oxygen with a (-2) charge since O is from Group 6A. Its symbol is O2-

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

          • K+ will have a subscript of 2 from O2- → K2

          • O2- will have a subscript of 1 from K+ → O

          • Subscript 1 is no longer indicated → K2O(aq)

Recall: Group 1A ions are soluble


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Problem Details

What is the chemical equation for potassium oxide + water → potassium hydroxide?

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