Hydrogen ion and hydroxide ion concentration are terms used in chemistry to describe the concentration of ions in a solution.
The concentration of hydrogen ions (H+) in a solution is referred to as the “acidic” or “pH” level of that solution. A solution with a higher concentration of hydrogen ions is more acidic, while a solution with a lower concentration of hydrogen ions is more basic.
The hydroxide ion (OH-) concentration, on the other hand, is used to describe the basicity of a solution. A solution with a higher concentration of hydroxide ions is more basic, while a solution with a lower concentration of hydroxide ions is more acidic.
In pure water at 25°C, the concentration of hydrogen ions (H+) and hydroxide ions (OH-) is equal, which results in a neutral pH of 7. However, when an acid or base is added to the solution, the equilibrium shifts, and the concentration of hydrogen ions or hydroxide ions may increase or decrease accordingly.
In summary, hydrogen ion and hydroxide ion concentration are important measures of acidity and basicity in a solution, with the concentration of hydrogen ions indicating acidity and the concentration of hydroxide ions indicating basicity.