AFOQT Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the AFOQT Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Practice this question and more.

What pH level indicates a strong base?

A pH of 4
A pH of 6
A pH of 8
A pH between 7 and 14

The correct answer is: A pH between 7 and 14

A strong base is one that is capable of completely dissociating in water, resulting in a high concentration of hydroxide ions (OH⁻) and a corresponding pH level typically above 7. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral. Therefore, any pH level above 7 indicates a basic or alkaline solution, with higher values representing stronger bases. Specifically, a pH that is significantly greater than 7, approaching 14, suggests a very strong base. Hence, the correct answer is that a pH level between 7 and 14 indicates a strong base. Other values provided in the options, such as pH levels of 4, 6, and 8, do not accurately represent strong bases. A pH of 4 and 6 indicate acidic and mildly acidic solutions, respectively, while a pH of 8 suggests a weak base, as it is only slightly above neutral. This understanding of the pH scale is essential for recognizing the nature of various solutions in chemistry.