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colar of methyl red solution at pH = 7.8

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Methyl red is a common acid-base indicator.
It has a Ka equal to 6.3 e -6. Its unionized form is red and its anionic form is yellow. What color would a methyl red solution have a pH = 7.8?

red
yellow
blue
violet
green

For this problem I am confused on how to start... Can you please help me?

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Solution Summary

The solution is comprised of detailed explanations of finding the color of of methyl red solution at pH = 7.8.

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Methyl red is actually a weak acid, which is represented by HA.
In the solution, HA <----> H+ + A-
and pKa = 5.2
In unionized form ...

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