Which pH value indicates the most basic solution?

Which pH value indicates the most basic solution?

• A. 11
• B. 7
• C. 8
• D. 3

Answer: (A)

On the pH scale, 7 is neutral. Values above 7 indicate basic solutions, and higher numbers mean stronger bases. Among the options, the largest pH is 11, which makes it the most basic. The reason is that pH is a log measure of hydrogen ion concentration: as pH increases, [H+] decreases, and a jump to 11 represents about a 10,000-fold decrease in hydrogen ions, yielding a strongly basic solution. The value 8 is basic but less basic than 11; 7 is neutral; 3 is acidic.

On the pH scale, 7 is neutral. Values above 7 indicate basic solutions, and higher numbers mean stronger bases. Among the options, the largest pH is 11, which makes it the most basic. The reason is that pH is a log measure of hydrogen ion concentration: as pH increases, [H+] decreases, and a jump to 11 represents about a 10,000-fold decrease in hydrogen ions, yielding a strongly basic solution. The value 8 is basic but less basic than 11; 7 is neutral; 3 is acidic.