# Equilibrium Shifts When Adding B(g) to A+B System

• disneychannel
In summary, when additional B is added to the system at equilibrium, the concentration of B will decrease while the concentrations of A and C will increase. The equilibrium will shift to the right. The initial conditions of the system may affect the outcome. It is important to keep in mind that the addition of extra B will create more product, requiring A to decrease. Semantics should not be a focus in understanding this concept.
disneychannel

## Homework Statement

What factors will change when additional B(g) is added to the following system at equilibrium.
Overall Reaction: A(g) + B(g) $\Leftrightarrow$(g)

## The Attempt at a Solution

I said decreases, [A] decreases, [C] increases, and equilibrium will shift to the right...but i got it wrong...why and what would it be then?

If additional B is added, the last thing I would posit is that B would decrease. Everything else you have seems correct.

then why would A decrease...

When more product is made, it requires A to do so. A decreases. I believe your actual difficulty is one of initial conditions. You've assumed that the initial conditions are at a point after the addition of extra B and before the new mixture comes to equilibrium but the question assumes it is before B is added.
It appears that you have a good grasp of the concept so relax and don't debate semantics. You'll get nowhere with that.

Okay! Thank You!

## 1. What is equilibrium shift?

Equilibrium shift refers to the change in the concentrations of reactants and products in a chemical reaction as it progresses towards equilibrium. It can occur when there is a change in the conditions of the reaction, such as temperature, pressure, or concentration of reactants or products.

## 2. How does adding gas B affect the equilibrium of an A+B system?

Adding gas B to an A+B system can cause an equilibrium shift by changing the concentrations of the reactants and products. This can be due to the increase in the overall pressure of the system, which can favor the side with fewer moles of gas according to Le Chatelier's principle. It can also cause a shift if gas B is a reactant or product in the equilibrium equation.

## 3. Will the equilibrium shift towards the reactants or products when adding gas B to an A+B system?

The equilibrium will shift towards the side with fewer moles of gas when adding gas B to an A+B system. This is because an increase in pressure favors the side with fewer moles of gas according to Le Chatelier's principle. However, the exact direction of the shift also depends on the stoichiometry of the reaction and the equilibrium constant.

## 4. How does the concentration of gas B affect the equilibrium shift in an A+B system?

The concentration of gas B can affect the equilibrium shift in an A+B system depending on its role in the equilibrium equation. If gas B is a reactant, an increase in its concentration will shift the equilibrium towards the products, and vice versa. However, if gas B is a product, an increase in its concentration will shift the equilibrium towards the reactants.

## 5. Can the equilibrium shift back to its original position after adding gas B to an A+B system?

Yes, the equilibrium can shift back to its original position after adding gas B to an A+B system. This can happen if the change in conditions is reversible, such as a change in pressure or concentration. The equilibrium will shift back until it reaches a new equilibrium point, where the rates of the forward and reverse reactions are equal again.

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