Studying the Equilibrium of a Weak Acid, HSO_4^- Ion, in water (1) What is the i

Question

Studying the Equilibrium of a Weak Acid, HSO_4^- Ion, in water (1) What is the initial color of the mixtures in Wells A -1, A-2, A- 3, A - 4, and A- 5? What color change do you observe when you add Na_2SO_4 solution to Well A - 1? What color change do you observe as you add solid NaHSO_4 to Well A- 3? What color change do you observe when you heat the mixture from Well A - 4 in the hot water bath? (5) What color change do you observe when you cool the pipet containing the mixture from Well A -5 in the ice-water bath? (6) What color change do you observe when you cool the pipet containing the heated mixture from Well A-4 in the ice-water bath? (7) What color change do you observe when you heat the cooled mixture from Well A-5 in the hot water bath? (8) Write the net ionic equator for the equilibrium involving HSO_4^- ion in this experiment Predict the direction in which the equilibrium should shift when you add Na_2SO_4 solution to the mixture in Well A-1. Briefly explain. (10) Briefly explain how your observations do or do not support your promotion in (9). (11) Predict the direction to which the equilibrium should shift when you add solid NaHSO_4 to the mixture in Well A- 3. Briefly explain. (12) Briefly explain how your observations do or do not support your prediction in (11). (13) Based upon your observations of heating and cooling the mixtures in Wells A- 4 and A-5, is the forward reaction for the HS0_4^- ion equilibrium endothermic or exothermic? Briefly explain. (14) Write the net ionic equation for the HSO_4^ion equilibrium again, but include heat in the equation this time.

Explanation / Answer

Equilibrium study for weak acid HSO4-

(1) the intiial color is pink with HSO4- in water and yellow-orange in other cells

(2) adding SO4^2- shifts equilibrium to left to pink

(3) adding NaHSO4, increases HSO4-, shifts equilibrium to right, orange

(4) heating shifts equilibrium to right to orange

(5) Colling brings back HSO4- to pink

(6) cooling has no effect when only HSO4- is present

(7) heating would form more ionized species to yellow color

(8) net ionc : HSO4- + H2O <==> H3O+ + SO4^2-

(9) when Na2SO4 added, equilbrium shifts to right

(10) The change in solor supports this data

(11) when NaHSO4 is added, color changes to orange due to shift of equilibrium to the right

(12) The change in color from pink to orange supports this data

(13) The forward reaction is endothermic in nature

(14) net ionc with heat

HSO4- + H2O + heat <==> H3O+ + SO4^2-

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