Question

The indicator phenol red changes from yellow to red between pH 6.8 and pH 8.4. If phenol is red added to a solution, and the solution turns red then

A.) The solution is basic and the pH must be at or below 7.0.

B.) The pH of the solution must be below 6.8, and the solution is basic.

C.) The pH of the solution must be below 6.8, and the solution is acidic.

D.) The pH of the solution must be above 8.4, and the solution is basic

E.) The pH of the solution is above 8.4, and the solution is acidic.

please answer with proper explanation and concepts used step by step with appropriate formula

Answer 1

So option A is the correct choice.