A solution with a pH of 7.0: (Choose all that apply) Group of answer choices would have an equal number of hydrogen and hydroxide ions. would have fewer hydrogen ions than hydroxide ions. would be an acid solution. would be considered neutral
The Correct Answer and Explanation is:
The correct answers are:
- Would have an equal number of hydrogen and hydroxide ions.
- Would be considered neutral.
Explanation:
The pH scale measures the concentration of hydrogen ions ([H⁺]) in a solution. The scale ranges from 0 to 14, with 7 being neutral. This means that in a neutral solution, the concentrations of hydrogen ions and hydroxide ions (OH⁻) are equal.
- Equal number of hydrogen and hydroxide ions:
A solution with a pH of 7.0 is neutral, and for neutral water, the concentration of hydrogen ions and hydroxide ions is equal. Specifically, both ions are present at a concentration of 1 × 10⁻⁷ mol/L. This is a key characteristic of neutral solutions. - Fewer hydrogen ions than hydroxide ions:
This statement is incorrect. In a neutral solution, the concentrations of hydrogen ions and hydroxide ions are exactly the same. If there were fewer hydrogen ions than hydroxide ions, the solution would be basic (alkaline), with a pH greater than 7.0. - Would be an acid solution:
A solution with a pH of 7.0 is not acidic. An acidic solution has a pH less than 7.0, meaning the concentration of hydrogen ions is greater than that of hydroxide ions. Since a pH of 7.0 indicates equal concentrations of both ions, the solution is neutral, not acidic. - Would be considered neutral:
A pH of 7.0 is the defining characteristic of a neutral solution, which means that neither the hydrogen nor hydroxide ions are in excess. Pure water at 25°C has a pH of 7.0, indicating it is neither acidic nor basic, but neutral.
In summary, a solution with a pH of 7.0 has equal concentrations of hydrogen and hydroxide ions and is considered neutral, not acidic or basic.
