Determining the Equilibrium Constant for the Indicator Methyl Red

Indicators are often used to show a color change when a solution crosses a certain pH.  There are many different indicators that change colors across a wide variety of pH's, but in order to determine what pH this transition occurs at we need to know the equilibrium constant.  This experiment will guide students through the determination of concentration for both the acidic and basic forms of methyl red to determine the equilibrium constant using Beer's Law.

Click "Resources" below for a PDF of the experiment. 

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