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