A chemical system can be thought of as being either:

  1. How To Calculate Keq With Temperature
  2. Keq Equation Example

1.At equilibrium

How To Calculate Keq With Temperature

To calculate K eq. For a set of related equations, if given the K eq for one equation, be able to generated the K eq for the other equations. Equilibrium Expressions Involving Pressure: Often, the relative amounts of gases are given in terms of pressure, rather than concentrations. Equilibrium Constant Definition. The equilibrium constant is the value of the reaction quotient that is calculated from the expression for chemical equilibrium.It depends on the ionic strength and temperature and is independent of the concentrations of reactants and products in a solution. Calculating the Equilibrium Constant For A Reaction CALCULATING THE EQUI L IBRIUM CONSTANT FOR A REACTION Name Section 1’. Write the equilibrium expression, given the following general equation. AA(g) + bB(g) cC(g) + dD(g) c K = CDd AaBb Distinguish between the Kp and Kc for the reaction. Kc = CcDd AaBb Kp = Pc CP d D Pa AP b B K. Calculating an Equilibrium Constant from the Free Energy Change. If we know the standard state free energy change, G o, for a chemical process at some temperature T, we can calculate the equilibrium constant for the process at that temperature using the relationship between G o and K. Rearrangement gives In this equation.
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2.Not at equilibrium

A system which is not at equilibrium will move spontaneously to a position of being at equilibrium.

What is Keq : The 'K' in Keq stands for 'Constant'. The 'eq' means that the reaction is at equilibrium. Very roughly, Keq tells you the ratio of Products/Reactants for a given reaction at equilibrium at a certain temperature.

K eq = [Products] / [Reactants]

Consider the reaction

2HI(g ) < ---------------> H2(g) + I2(g)
How

that if you take the [H2], the [I2] and the [HI] in an equilibrium mixture of these at 423 °C,the expression

[H 2 ] [I 2 ] / 2 [HI] = 0.0183

this is Keq expression this is value of Keq
Writing Keq Expressions:
Consider the general reaction:
aA + bB <------> cC + dD
where, A,B,C,D denote the reactants and prodcuts and a,b,c,d are coefficients in the balanced chemical equation.The equilibrium-constant expression for a reaction is an expression obtained by multiplying the concentrations of products,dividing by th concentration of reactants and raising each concentration term to a power equal to the coefficent in the chemical equation.
The equilibrium constant Kc is the value obtained for the equilibrium-constant expression when equilibrium concentrations are substituted.
Keq= [C]c [D]d / [A]a [B] b
Here you denote the molar concentration of a substance by writing its formula is square brackets.The subscript eq on the equilibrium contant means that it is defined in terms of molar concentrations.
Free
The Keq Expressions for Solids and Liquids
For solids: When we write the Keq expression for a reaction with solids, we simply leave out the solids.

the Keq expression for the equation:

CaCO3(s) <---------> CaO(s) яАл + CO2(g)

is simply: Keq = [CO2]

The same argument that was used for solids can also be used for liquids. Thus, we can expand the last statement:

Keq Equation Example

'When we write the Keq expression for a reaction with solids or liquids, we simply leave out the solids and the liquids'.

Gases and aqueous solutions do undergo changes in concentration so they are always

included in the Keq expression.