Question

Ethyl acetate, a solvent used in many fingernail-polish removers, is made by the reaction of acetic acid with ethanol: CH3CO2H(soln)Aceticacid +C2H5OH(soln)Ethanol⇌CH3CO2H(soln)Ethylacetate+H2O(soln)ΔH∘=−2.9kJ

Part A

Does the amount of ethyl acetate in an equilibrium mixture increase or decrease when the temperature is increased? Does the amount of ethyl acetate in an equilibrium mixture increase or decrease when the temperature is increased?

increase

decrease

Part B

How does Kc change when the temperature is decreased? Justify your answers using Le Chatelier's principle.

1- As the temperature is decreased, the reaction shifts from left to right. The product concentrations increase, and the reactant concentrations decrease. This corresponds to an increase in Kc.

2- As the temperature is decreased, the reaction shifts from right to left. The product concentrations decrease, and the reactant concentrations increase. This corresponds to an decrease in Kc.

3-As there is neither products no reactants in gas state the temperature does not shift the reaction. So decrease in temperature does not change Kc. SubmitMy AnswersGive Up

Answer 1

Ethyl acetate, a solvent used in many fingernail-polish removers, is made by the reaction of acetic acid with ethanol:

CH₃COOH(l) + CH₃-CH₂-OH(l) ⇌ CH₃-CO-OCH₂-CH₃(l) + H₂O(l) ΔH∘=−2.9kJ (Exotermic)

Part A:

Does the amount of ethyl acetate in an equilibrium mixture increase or decrease when the temperature is increased?

When heating, some of the heat statement does not serve to increase the temperature, but invested in increasing the chemical energy, resulting in the endothermic reaction sense. Thus, the system evolves opposing the external action, and the temperature rise is less than expected. Therefore if the ratio varies reaction, does not change the amount of ethyl acetate .

Part B:

How does Kc change when the temperature is decreased? Justify your answers using Le Chatelier's principle.

1- As the temperature is decreased, the reaction shifts from left to right. The product concentrations increase, and the reactant concentrations decrease. This corresponds to an increase in Kc.

R/ Temperature is the only factor that varies the value of the equilibrium constant: the state of balance is disrupted by heating or cooling because not change the reaction quotient, but because it makes the equilibrium constant. With increasing temperature, the system evolves in the endothermic direction, and the decrease in the exothermic. In this case the balance is directed from left to right.

2- As the temperature is decreased, the reaction shifts from right to left. The product concentrations decrease, and the reactant concentrations increase. This corresponds to an decrease in Kc.

3-As there is neither products no reactants in gas state the temperature does not shift the reaction. So decrease in temperature does not change Kc.