6. What is the pH of a solution with a pH of 7?
Answer: C
The pH of a solution with a pH of 7 is neutral.
A solution with a pH of 7 is considered neutral, meaning it is neither acidic nor basic. This value represents the midpoint of the pH scale, where the concentration of hydrogen ions equals the concentration of hydroxide ions.
A) Acidic
This option is incorrect because a solution with a pH less than 7 is classified as acidic. Since the question specifies a pH of 7, it cannot be acidic.
B) Basic
This option is also incorrect. A basic solution has a pH greater than 7. Therefore, a solution with a pH of 7 cannot be described as basic.
C) Neutral
This is the correct option. A pH of 7 indicates that the solution is neutral, which is the standard definition of neutrality in the context of the pH scale.
D) Positive
This option is misleading and incorrect in the context of the pH scale. While pH values can be expressed as positive numbers, the term "positive" does not accurately describe the nature of a solution's acidity or basicity.
Conclusion
The pH of 7 is definitively classified as neutral, distinguishing it from both acidic (pH < 7) and basic (pH > 7) solutions. All other options fail to accurately represent the characteristics of a solution at this specific pH, reinforcing the fundamental concept of neutrality in acid-base chemistry.