# Solved Chemistry Problems

First, we set up a table with the initial concentrations, the changes in concentrations, and the equilibrium concentrations using −H are allowed to react in 1 L of the solvent dioxane, equilibrium is established when 1313 mol of each of the reactants remains.Calculate the equilibrium constant for the reaction.

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The last row contains the concentrations once equilibrium has been reached.

, what is the equilibrium constant for the reaction?

First, however, it is useful to verify that equilibrium can be obtained starting from two extremes: all (or mostly) reactants and all (or mostly) products (similar to what was shown in Figure 2 in Chapter 13.2 Equilibrium Constants).

Consider the ionization of 0.150 M HA, a weak acid.

We learned to approach three basic types of equilibrium problems.

When given the concentrations of the reactants and products at equilibrium, we can solve for the equilibrium constant; when given the equilibrium constant and some of the concentrations involved, we can solve for the missing concentrations; and when given the equilibrium constant and the initial concentrations, we can solve for the concentrations at equilibrium.Determining Relative Changes in Concentration Complete the changes in concentrations for each of the following reactions.(a) (b) (c) Solution (a) (b) (c) Check Your Learning Complete the changes in concentrations for each of the following reactions: (a) (b) (c) , as it will be the only unknown.Solution We will begin this problem by calculating the changes in concentration as the system goes to equilibrium.Then we determine the equilibrium concentrations and, finally, the equilibrium constant.(Note: Water is not a solvent in this reaction.) Calculation of a Missing Equilibrium Concentration Nitrogen oxides are air pollutants produced by the reaction of nitrogen and oxygen at high temperatures.At 2000 °C, the value of the equilibrium constant for the reaction, , is 4.1 × 10] 0.0089 mol/L.This technique, commonly called an ICE chart—for Initial, Change, and Equilibrium–will be helpful in solving many equilibrium problems.A chart is generated beginning with the equilibrium reaction in question.If we did not know the magnitude of the change in the concentration of N The simplest way for us to find the coefficients for the concentration changes in any reaction is to use the coefficients in the balanced chemical equation.The sign of the coefficient is positive when the concentration increases; it is negative when the concentration decreases.

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