Answer all 3 of the following questions based on the formula: HIn + H₂O ⇌ H₃O⁺ + In^-

1. Consider the indicator equilibrium, where "HIn" is yellow and "In^-" is red: HIn + H₂O ⇌ H₃O⁺ + In^-

Which of the following is true about the transition point of this indicator?

a) pH = 7.0

b) [HIn] = [In^–]

c) [HIn] > [In^–]

d) moles of H₃O⁺ = moles of In^–

2. When a few drops of the indicator methyl red (for which HIn is red and In^- is yellow) are added to 1.0 M HCl, the color of the resulting solution is

When a few drops of the indicator methyl red (for which HIn is red and In^- is yellow) are added to 1.0 M HCl, the color of the resulting solution is

a) yellow and the reactants are favoured

b) yellow and the products are favoured

c) red and the reactants are favoured

d) red and the products are favoured

3. When a few drops of the indicator phenol red (for which HIn is yellow and In^- is red) are added to 1.0 M NaOH, the indicator equilibrium

a) shifts right and the colour of the solution turns red

b) shifts left and the colour of the solution turns yellow

c) shifts right and the colour of the solution turns yellow

d) shifts left and the colour of the solution turns red

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c HIn In The transition point is the point at which the indicator changes co... View the full answer