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Three solutions of Triblu indicator, all of equal concentration, were made at pH 1, pH 6 and pH 10. The pH 1 solution had an

Three solutions of Triblu indicator, all of equal concentration, were made at pH 1, pH 6 and pH 10.

The pH 1 solution had an absorbance at 620 nm of 0.318, while the pH 10 solution had an absorbance of 0.438.

If Triblu indicator has a pKa of 5.0, what would the absorbance of the pH 6 solution be at 620 nm?

Answer to three decimal places.

the answer I currently have is 0.348, yet I don't think this is correct.

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