Question

In a reversible reaction when three is a decreases in the volume on the product side (xi) (d) 90 the relation is expressed as: (a)K=K (b)K>K (c)K

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Answer 1

Explanation:

start subscript, start text, c, end text, end subscript.

What does the magnitude of K_\text cK

c

K, start subscript, start text, c, end text, end subscript tell us about the reaction at equilibrium?

The magnitude of K_\text cK

c

K, start subscript, start text, c, end text, end subscript can give us some information about the reactant and product concentrations at equilibrium:

If K_\text cK

c

K, start subscript, start text, c, end text, end subscript is very large, ~1000 or more, we will have mostly product species present at equilibrium.

If K_\text cK

c

K, start subscript, start text, c, end text, end subscript is very small, ~0.001 or less, we will have mostly reactant species present at equilibrium.

If K_\text cK

c

K, start subscript, start text, c, end text, end subscript is in between 0.001 and 1000, we will have a significant concentration of both reactant and product species present at equilibrium.

By using these guidelines, we can quickly estimate whether a reaction will strongly favor the forward direction to make products—very large K_\text cK

c

K, start subscript, start text, c, end text, end subscript—strongly favor the backward direction to make reactants—very small K_\text cK

c

K, start text, end subscript, which is also sometimes written as K_\text{eq}K

eq

K, start subscript, start text, e, q, end text, end subscript or KKK. The \text ccstart text, c, end text in the subscript stands for concentration since the equilibrium constant describes the molar concentrations, in \dfrac{\text{mol}}{\text{L}}

L

mol

start fraction, start to get the correct value for K_\text cK

c

K, start subscript, start text, c, end text, end subscript.

Note: If any of the reactants or products are gases, we can also write the equilibrium constant in terms of the partial pressure of the gases. We typically refer to that value as K_\text pK

p

K, start subscript, start text, p, end text, end subscript to tell it apart from the equilibrium constant using concentrations in molarity, K_\text cK

c

K, start subscript, start text, c, end text, end subscript. In this article, however, we will be focusing on K_\text cK

c

K,