K = –7.52 × 10^–2

K = 13.3

K = 0.15

K = 3.76 × 10^–2

K = 7.52 × 10^-2

The rates of the forward and reverse reactions are the same.

The rates of both the forward and reverse reactions are equal to zero.

The rate of the forward reaction is faster.

The rates of the forward and reverse reactions are oscillating to keep the system at equilibrium.

The rate of the reverse reaction is faster.

The CO₂ is obtained from the air. 

Sublimation of solid CO₂ (dry ice). 

Reaction of a carbonate with an acid. 

The CO₂ is obtained from a cylinder of the gas. 

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the rate at which products are being converted into reactants has become zero

all of the reactants have been converted into products

the temperature of the reaction has become constant

the conversion of reactants into products has ceased

the concentrations of reactants and products have become constant

the OH^- will react with the H⁺ to form water causing less H₂CO₃ to dissociate, increasing the amount of H₂CO₃

OH^- is not involved in this reaction so it will have no effect on the amount of H₂CO₃

the OH^- will react with the H⁺ to form water and more H₂CO₃ will dissociate, reducing the amount of H₂CO₃

OH^- is not involved in these reactions so it will have no effect on the solubility of CO₂ in water

the OH^- will react with the H⁺ to form water causing less H₂CO₃ to dissociate, increasing the amount of H₂CO₃ which causes less CO₂(g) to dissolve. 

the OH^- will react with the H⁺ to form water and more H₂CO₃ will dissociate, reducing the amount of H₂CO₃ which then reduces the amount of CO₂(aq), causing more CO₂(g) to dissolve. 

when C is removed more B will react to form C, but this has no effect on the amount of A

when C is removed more B will react to form C, which causes some of A to form B, so the amount of A will decrease. 

removing C has no effect on the amounts of A and B