The general reaction between a metal oxide and an acid is the formation of a salt and water.
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The reaction between a metal oxide and an acid typically involves an acid-base neutralization reaction. In this process, the metal oxide, which is a basic substance, reacts with an acid to form water and a salt. The metal oxide, acting as a base, accepts protons (H+) from the acid. The general equation for this reaction is:
Metal oxide (basic) + Acid → Salt + Water
For example, the reaction between calcium oxide (CaO) and hydrochloric acid (HCl) produces calcium chloride (CaCl₂) and water:
CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)
This reaction characterizes the neutralization of an acid by a basic metal oxide.