Question

Indicators are typically weak acids and the equilibrium can bedescribed as follows:

HInd + H2 H3O⁺ +Ind^- ΔH= -2 kJ/mol

Assume that HInd is red incolor and Ind^- is blue in color.

a) If a solution is purple(equal concentration of the two species), what color will thesolution turn when NaOH or other base is added to the solution?Explain in terms of Le Chatelier's Principle.

b) If a solution is purple(equal concentrations of the two species), what color will thesolution turn when the system is cooled in an ice bath? Explain interms of the Le Chatelier's principle.

Indicators are typically weak acids and the equilibrium can be described as follows:Assume that HInd is red in color and Ind- is blue in color. a) If a solution is purple (equal concentration of the two species), what color will the solution turn when NaOH or other base is added to the solution? Explain in terms of Le Chatelier's Principle. b) If a solution is purple (equal concentrations of the two species), what color will the solution turn when the system is cooled in an ice bath? Explain in terms of the Le Chatelier's principle.

Show transcribed image text Indicators are typically weak acids and the equilibrium can be described as follows:Assume that HInd is red in color and Ind- is blue in color. a) If a solution is purple (equal concentration of the two species), what color will the solution turn when NaOH or other base is added to the solution? Explain in terms of Le Chatelier's Principle. b) If a solution is purple (equal concentrations of the two species), what color will the solution turn when the system is cooled in an ice bath? Explain in terms of the Le Chatelier's principle.