Yes, basic solutions do contain H+ (aq) ions, but in much lower concentrations compared to hydroxide ions (OH-). The defining characteristic of a basic solution is that the concentration of OH- ions is greater than the concentration of H+ ions. This difference in concentration is what makes the solution basic, despite the presence of H+ ions.
Here’s a more detailed explanation:
H+ and OH- in all aqueous solutions:
Water, the solvent in many aqueous solutions, undergoes a slight degree of ionization, producing both H+ and OH- ions,. These ions are always present, even in neutral, acidic, or basic solutions.
Basic solution definition:
A basic solution is defined by having a higher concentration of OH- ions compared to H+ ions.
pH scale:
The pH scale is a measure of the concentration of H+ ions. A pH of 7 is neutral, a pH below 7 indicates acidity (more H+), and a pH above 7 indicates basicity (more OH-).
Example:
Sodium hydroxide (NaOH), a common base, dissolves in water to release OH- ions, which increases the concentration of OH- in the solution compared to H+.