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Methyl red is a common acid-base indicator. it has a ka 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?

Respuesta :

mixter17
Hello!

The pKa of an indicator tells us the pH where it changes color. The pKa of Methyl red is 

[tex]pKa=-log(Ka)=-log( 6,3*10^{-6} )=5,20[/tex]

So, at a pH=7,8, Methyl Red would be at a pH over its pKa, so it would be in its basic form. The Basic Form of Methyl Red is Yellow, so the solution would be Yellow.

Have a nice day!

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