* pH scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14, with:
* 0-6.9: Acidic
* 7: Neutral
* 7.1-14: Basic (alkaline)
* Hydrogen ions and pH: The concentration of hydrogen ions (H+) in a solution determines its pH. The higher the concentration of H+, the lower the pH, and the more acidic the solution.
* Neutral solution: A neutral solution has an equal concentration of H+ and hydroxide ions (OH-).
When you add H+ ions to a neutral solution:
* The concentration of H+ ions increases.
* This shifts the balance, making the concentration of H+ higher than OH-.
* The pH of the solution decreases, moving it into the acidic range.
Example:
* Pure water is neutral with a pH of 7.
* Adding an acid like hydrochloric acid (HCl) to water releases H+ ions.
* This increases the H+ concentration, making the water acidic (pH less than 7).
In summary, adding hydrogen ions to a neutral solution increases the acidity of the solution by lowering the pH.
