# Difference between products and reactants? Equilibrium

• Ned Taylor
In summary, the question asks for the value of Keq at equilibrium for the given reaction. The equilibrium concentrations of the reactants and products are [C] = 0.20 mol/L, [D] = 0.55 mol/L, [A] = 0.30 mol/L, and [B] = 0.48 mol/L. Using the equation K=products/reactants, the value of Keq can be calculated to be 1.3 if C and D are considered reactants, and 0.7638 if A and B are considered reactants. The correct way to determine the reactants and products is by writing out the equation and understanding the definition of equilibrium constant.
Ned Taylor

## Homework Statement

Given the reaction, at equilibrium, it was found that [C] = 0.20 mol/L, [D] = 0.55 mol/L, [A] = 0.30 mol/L and [ B] = 0.48 mol/L. Calculate the value of Keq.
Reaction: C + D <--> A + B

## Homework Equations

K=products/reactants

## The Attempt at a Solution

[/B]
If we assume that C and D are the reactants then the value of Keq would be:
K=A+B/C+D since K= products/reactants

But if we assume that A+B are the reactants than Keq would be;
K=C+D/A+B

Since these give two difference answers( K=1.3 for the first method, and K=.7638) how does one tell what are the products and reactants. Thanks to anyone who can help me with this!
Ned

Last edited by a moderator:
You are given reaction and it is clear which way it is intended to be treated.

You are right it is not always obvious, but writing down the equation you are following will always make the situation unambiguous.

Commonly said there are no stupid questions. But if there were any this would be it!

You need to look up the definition of an equilibrium constant. And even without thermodynamics you can understand enough of its rationale and then you would not have written K=C+D/A+B

## 1. What is the difference between products and reactants?

The reactants are the starting materials in a chemical reaction, while the products are the resulting substances after the reaction has taken place.

## 2. What is the significance of equilibrium in a chemical reaction?

Equilibrium is a state in which the rate of the forward reaction is equal to the rate of the reverse reaction. This means that the amount of reactants and products remain constant, resulting in a stable system.

## 3. How does the concentration of reactants and products affect equilibrium?

The concentration of reactants and products can affect the equilibrium position of a chemical reaction. If the concentration of reactants is increased, the equilibrium will shift towards the products, and vice versa.

## 4. Can equilibrium be influenced by external factors?

Yes, external factors such as temperature, pressure, and the presence of a catalyst can influence the equilibrium position of a chemical reaction.

## 5. How is equilibrium represented in a chemical equation?

Equilibrium is represented by a double arrow (↔) in a chemical equation, indicating that the reaction can occur in both the forward and reverse directions.

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