7.10-7.11: Reaction Quotient & Le Chatelier and Solubility

Possible Quiz Questions

Multiple Choice

The equilibrium reaction between Cl2 and H2O at 25 C is represented by the chemical equation shown. If a solution at equilibrium at 25 C is diluted with distilled water to twice its original volume, which of the following gives the value for Qc and predicts the response by the system immediately after dilution?

• $$Q_c=4K_c$$ and the rate of the reverse reaction will be greater than the rate of the forward reaction

• $$Q_c=4K_c$$ and the rate of the forward reaction will be greater than the rate of the reverse reaction

• $$Q_c=\frac{K_c}{4}$$ and the rate of the reverse reaction will be greater than the rate of the forward reaction.

• $$Q_c=\frac{K_c}{4}$$ and the rate of the forward reaction will be greater than the rate of the reverse reaction

Multiple Choice

2NO (g) + Cl₂ (g) <--> 2 NOCl (g) K_C = 2000

A mixture of NO g and Cl₂ g is placed in a previously evacuated container and allowed to reach equilibrium according to the chemical equation above. When the system is at equilibrium the concentrations are listed in the table.

Which of the following is true if the volume of the container is decreased by one half?

• Q = 100, and the reaction will proceed toward reactants

• Q = 100, and the reaction will proceed toward products.

• Q = 1000, and the reaction will proceed toward reactants.

• Q = 1000, and the reaction will proceed toward products

Possible Quiz Questions

Multiple Choice

According to the information about the dissolution of Ba(IO₃)₂ (s) shown, the correct value of S, the molar solubility of Ba(IO₃)₂ (s) can be calculated using with of the following mathematical relationships?

• $$\frac{1}{2}S\ =\ 4\times10^{-9}M$$

• $$2\ S\ =\ 4\times10^{-9}\ M$$

• $$S^2=4\times10^{-9}\ M$$

• $$4S^3\ =\ 4\times10^{-9}$$

Multiple Choice

The chemical equation above represents the equilibrium that exists in a saturated solution of Ag₂CO₃. If S represents the molar solubility of Ag₂CO₃, which of the following mathematical expressions shows how to calculate S based on K_sp?