A buffer solution composed of a weak acid/conjugate base pair. HX/X. is blue whe
ID: 936110 • Letter: A
Question
A buffer solution composed of a weak acid/conjugate base pair. HX/X. is blue when the HX:X- ratio is greater than 1 and green when the HX:X- ratio is less than 1. When the HX:X- ratio is 1:1. the solution is colorless. The Ka for HX is equal to 1.2 x 10-7. Write an equilibrium reaction to describe the HX/X- buffer. What color is the solution when the reactant and product concentrations are given by the Ka? Justify your answer. Use a particulate-level illustration to represent a 0.1 M solution of HX(aq). Use no more than 10 HX molecules and assume 1% ionization. NaOH is added to the HX/X- buffer until a color change occurs. What color is observed? Justify your answer. An acids dissociation constant, Ka. represents the ratio of the product of the product concentrations to the product of the reactant concentrations at equilibrium How can a system be at equilibrium when this ratio does not equal 1? Assume that the dissociation of HX(aq) into its ions is an exothermic process What color will a colorless buffer turn when heated? Justify your answer.
Explanation / Answer
a.
HX < = > X- + H+ having Ka = 1.2
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