Transcription of Spectrophotometric Determination Of The Pka Of …
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Spectrophotometric Determination Of The Pka Of …
Spectrophotometric Determination of the pKa of bromothymol blue INTRODUCTION Acid-base indicators are compounds that are simply weak acids (or bases) that exhibit different colors depending on whether they are present in solution as their acidic form (HIn) or as their basic form (In-). As the pH of a solution containing the indicator changes, the equilibrium shown below will be driven either towards reactants (HIn), or products (In-) causing the solution color to change depending on the concentration of each form present. For example, in strongly acidic solution, most of the indicator will be present in the form HIn, causing the solution color to correspond to that of HIn. In strongly basic solutions , most of the indicator will be in the In- form, resulting the color 2 dominating the solution.
the pH 1 and the pH 13 bromothymol blue solutions. Your instructor will show you how to use the instrument. From the recorded spectra choose one wavelength ( λ1) at which the pH 1 . 1--Spectrophotometric Determination Of The Pka Of Bromothymol Blue ...
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