Methyl red is a common acid-base indicator. It has a K_a equal to 6.3 * 10^-6. Its un-ionized form is red and its anionic form is yellow. What color would a methyl red solution have at pH = 7.8

Question

Quizplus · Accepted Answer

At pH 7.8, the solution would be more basic than the pH range for which methyl red is an indicator. As a result, the color of the solution would be closer to the yellow color of the anionic form of the indicator. Therefore, the solution would appear yellow.

Methyl Red Is a Common Acid-Base Indicator