HCl N/10 solution, also known as hydrochloric acid N/10 solution, is a standardized solution of hydrochloric acid (HCl) commonly used in laboratory settings for various chemical analyses, titrations, and pH adjustments.

In the laboratory, HCl N/10 solution is commonly used in acid-base titrations, where it serves as the titrant, or the solution of known concentration, to determine the concentration of a base or an alkali in a given sample. It is also utilized in pH adjustments and neutralizations, as hydrochloric acid is a strong acid that can readily release hydrogen ions, thus lowering the pH of a solution.