* HCl is a strong acid: This means it completely dissociates (breaks apart) in water, releasing hydrogen ions (H+) and chloride ions (Cl-).
* Hydrogen ions determine acidity: The higher the concentration of H+ ions in a solution, the more acidic it is.
* pH scale: The pH scale measures acidity, with lower numbers indicating higher acidity. Pure water has a pH of 7, which is neutral. Adding HCl to water will decrease the pH below 7, making the solution acidic.
Example:
If you add HCl to water, the following reaction occurs:
HCl(aq) → H+(aq) + Cl-(aq)
The released H+ ions increase the concentration of hydrogen ions in the water, making it more acidic and lowering its pH.
