biochem

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I mixed 4.50mL of 10.0mM NaOH with .50mL phenol red. I need to calculate the pH of this solution. I have more information in my lab but I am not sure what data I need to look for. As part of the experiment I calculated pKa of Phenol Red. Do I use that pKa in the henderson-hasselbalch equation. If that is correct than I am not sure how to calculate the [HA]/[A-] ratio. Can anyone point me in the right direction?

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