Briefly explain how your observations do or do not support your prediction in (9

Question

Briefly explain how your observations do or do not support your prediction in (9). Predict the direction in which the equilibrium should shift when you add solid NaHSO_4, to the mixture in Well A-3. Briefly explain. Briefly explain how your observations do or do not support your prediction in (11). Based upon your observations of heating and cooling the mixtures in Wells A-4 and A-5, is the forward reaction for the HSO_4^- ion equilibrium endothermic or exothermic? Briefly explain. Write the net ionic equation for the HSO_4^- ion equilibrium again, but include heat in the equation this time.

Explanation / Answer

chemical equation,

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

(11) Addition of solid NaHSO4 would shift the equilibrium towards right handside, that is more of SO4^2- would be formed by using excess of NaHSO4 added to the solution. This is according to the LeChatellier's principle which states that any change in equilibrium condition would shift the reaction in the direction so as to minimize that change.

(12) Change in color of the solution proves this prediction, the color becomes darker orange.

(13) The forward reaction for the HSO4- is endothermic in nature. This is proven by the fact that heating the solution with HSO4- (pink) changes color to orange (due to SO4^2- formation). Cooling this reaction now changes color from orange (SO4^2-) to pink (due to HSO4^2- formation). Reverse reaction is exothermic in nature.

(14) Net ionic reaction,

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

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