A student is given a solution of phenol red of unknown concentration. Solutions of phenol red are br — Spectrophotometry Chemistry Question

[H⁺] = 10^-pH = 10^-11.20 = 6.3×10^-12 M

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5.4 μM (values between 5.2 μM and 5.6 μM are acceptable)

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Less than. The diluted solution will have a lower concentration and therefore a lower absorbance, in accordance with Beer's law.

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Less than. 559 nm is the wavelength of maximum absorbance. The absorbance at any other wavelength will be lower.

1 point is earned for the correct answer with a valid justification.