The salt produced is copper(II) chloride , with the formula CuCl2\text{CuCl}_2CuCl2​.

Quick Scoop

  • Copper(II) oxide (CuO\text{CuO}CuO) is a basic metal oxide.
  • Hydrochloric acid (HCl\text{HCl}HCl) is an acid that always forms chloride salts.
  • When they react, they undergo a typical acid–base reaction:

CuO+2HCl→CuCl2+H2O\text{CuO}+2\text{HCl}\rightarrow \text{CuCl}_2+\text{H}_2\text{O}CuO+2HCl→CuCl2​+H2​O

This shows that the salt formed is copper(II) chloride (copper chloride) and water.

So, if someone asks, “what salt is produced when copper oxide reacts with hydrochloric acid?” the precise answer is: copper(II) chloride (CuCl₂).

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