Question

The Ka value for methyl red, a common pH indicator, is 5.0 x 10-6. HMR is...

The Ka value for methyl red, a common pH indicator, is 5.0 x 10-6. HMR is red, while MR- is yellow. What is the ratio of HMR to MR- and what color is a solution containing methyl red if the pH = 4.00?

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Answer #1

So

[HMR] / [MR-] = [H3O+] / Ka

=> [HMR] / [MR-] = 10^-4 / 5 * 10^-6

= 20

As the pH is less than 4.2 so it will be red in colour

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