* Hydrochloric acid is represented by HCl. This is the chemical formula, and it's always the same, whether the acid is concentrated or dilute.
* "Dilute" is a descriptor. It means the solution has a relatively low concentration of HCl compared to water. You might see it written as "dil. HCl" or "HCl (dil)" to indicate its dilution.
Important Note: While HCl is the symbol for hydrochloric acid, it's important to remember that it is a dangerous chemical and should be handled with caution.
