How does the pH of a base compare to that of pure water?

How does the pH of a base compare to that of pure water?

• A. It is always less than 7
• B. It is equal to 7
• C. It is greater than 7
• D. It can be either less than or greater than 7

Answer: (C)

The pH of a base is greater than 7. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral (like pure water). However, bases, which are substances that can accept hydrogen ions (H+) or donate hydroxide ions (OH-), cause an increase in the concentration of hydroxide ions in solution. This shift results in a pH level that exceeds 7, indicating a basic (alkaline) nature. Pure water, having a neutral pH of 7, serves as a reference point, and any substance categorized as a base will naturally have a higher pH value due to its ability to generate hydroxide ions, shifting the balance away from neutrality. This relationship clearly differentiates bases from neutral substances like water, confirming that the pH of a base always exceeds 7.

The pH of a base is greater than 7. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral (like pure water). However, bases, which are substances that can accept hydrogen ions (H+) or donate hydroxide ions (OH-), cause an increase in the concentration of hydroxide ions in solution. This shift results in a pH level that exceeds 7, indicating a basic (alkaline) nature.

Pure water, having a neutral pH of 7, serves as a reference point, and any substance categorized as a base will naturally have a higher pH value due to its ability to generate hydroxide ions, shifting the balance away from neutrality. This relationship clearly differentiates bases from neutral substances like water, confirming that the pH of a base always exceeds 7.