Name: Date: Advance Study Assignment: Properties of Systems in Chemical Equilibr

Question

Name: Date: Advance Study Assignment: Properties of Systems in Chemical Equilibrium - Le Chatelier's Principle Acid-base indicators change color in solution when [H^+] changes. They are sensitive to H^+ concentration because in solution they ionize in solution to produce H^+ ion. Methyl orange, HMO, is a common acid-base indicator which ionizes according to the equation: HMO(aq) H^+(aq) + MO(aq) red yellow If methyl orange is added to distilled water, the solution turns yellow. if a drop or two of 6M HC1 is added to the yellow solution, it turns red. If to that solution one adds a few drops of 6M NaOH the color reverts to yellow. Why does adding 6M HCI to the yellow solution to change to red? (Note that in solution HC1 exists as H^+ and Cl ions).

Explanation / Answer

Looking at the Methyl Orange Equilibrium Reaction, if you add protons (H+) to your distilled water you are pushing the Equilibrium to the left , increasing the amount of HMO(ac) that turns the solution red.

Being that said and taking into account that you are adding HCl 6M (H+ and Cl- ions at 6mol/L) and the Chatelier principle, you are pushing the reaction to the left creating more HMO(ac) that turns the solution red.

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