An acidic solution has a pH less than 7, indicating a greater concentration of hydrogen ions than pure water, which leads to higher hydronium ion concentration and lower hydroxide ion concentration.
An acidic solution is best defined as a solution with a pH less than 7.
This can be understood by considering the pH scale, where pH is the negative logarithm of the hydrogen ion concentration ([H+]).
A pH value below 7 indicates a higher concentration of hydrogen ions (H+) than found in pure water, and thus, more hydronium ions (H3O+) will be present in the solution.
Consequently, the concentration of hydroxide ions ([OH-]) would be lower, maintaining the constant for water (Kw).
Since acidic solutions have [H3O+] greater than 1.0 × 10-7 M, they are characterized by a pH lower than 7 and a pOH higher than 7, where 'pOH' is the negative logarithm of the hydroxide ion concentration.
The probable question may be:
Which of the following best defines an acidic solution?
A. A solution with a pH greater than 7
B. A solution with a pH equal to 7
C. A solution with a pH less than 0
D. A solution with a pH less than 7