IB Chemistry Topic R2.3.3 Magnitude of K and Temperature Dependence Revision Notes (SL/HL)

IB Chemistry Topic R2.3.3 Magnitude of K and Temperature Dependence Revision Notes (SL/HL) | RevisionDojo

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Equilibrium Constants and Their Applications

The Equilibrium Constant ($K$)

As discussed in the previous section, the equilibrium constant $K$ is a quantitative measure of the position of equilibrium for a chemical reaction.

It is expressed as:

$$
K = \frac{[\text{Products}]^{\text{stoichiometric coefficients}}}{[\text{Reactants}]^{\text{stoichiometric coefficients}}}
$$

Note

The magnitude of $K$ provides valuable information about the extent of a reaction at equilibrium.

When $K << 1$: Reactants are Favored
1. A very small $K$ value (e.g., $K = 10^{-5}$) indicates that the equilibrium position is heavily skewed toward the reactants.
2. Only a small proportion of reactants has been converted into products.
When $K \approx 1$: Comparable Amounts of Reactants and Products
1. When $K$ is close to 1 (e.g., $K = 0.8$), there are significant amounts of both reactants and products at equilibrium.
2. Neither direction of the reaction is strongly favored.
When $K >> 1$: Products are Favored

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Equilibrium Constants and Their Applications

The Equilibrium Constant ($K$)

As discussed in the previous section, the equilibrium constant $K$ is a quantitative measure of the position of equilibrium for a chemical reaction.

It is expressed as:

$$
K = \frac{[\text{Products}]^{\text{stoichiometric coefficients}}}{[\text{Reactants}]^{\text{stoichiometric coefficients}}}
$$

Note

The magnitude of $K$ provides valuable information about the extent of a reaction at equilibrium.

When $K << 1$: Reactants are Favored
1. A very small $K$ value (e.g., $K = 10^{-5}$) indicates that the equilibrium position is heavily skewed toward the reactants.
2. Only a small proportion of reactants has been converted into products.
When $K \approx 1$: Comparable Amounts of Reactants and Products
1. When $K$ is close to 1 (e.g., $K = 0.8$), there are significant amounts of both reactants and products at equilibrium.
2. Neither direction of the reaction is strongly favored.
When $K >> 1$: Products are Favored

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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry R2.3.3 Magnitude of K and Temperature Dependence Notes

Equilibrium Constants and Their Applications

The Equilibrium Constant ($K$)

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Equilibrium Constants and Their Applications

The Equilibrium Constant ($K$)

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics