Alizarin yellow R, \(Ka=7.9×10^{12}\), is yellow in its protonated form (HX) and red in its ionized form \((X^−)\). At what pH will alizarin yellow R be a perfect orange color?
I have no idea how to do this. I tried finding the pH of alizarin yellow, which is 11.1. Then what's next?

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@Rushwr

According to the indicators' colour change the pH at perfect orange is around 4 right?

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