Chemical Equilibrium

Front

What is chemical equilibrium?

Back

Chemical equilibrium is the state in a reversible reaction where the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products.

Front

What does the equilibrium constant (Keq) represent?

Back

The equilibrium constant (Keq) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their coefficients in the balanced equation.

Front

How do you calculate the equilibrium constant (Keq) for a reaction?

Back

Keq = [products]^[coefficients] / [reactants]^[coefficients], where [ ] denotes concentration.

Front

What is the relationship between pH and [H+] concentration?

Back

pH is the negative logarithm of the hydrogen ion concentration: pH = -log[H+].

Front

How do you calculate pH from [H+]?

Back

To calculate pH from [H+], use the formula: pH = -log[H+].

Front

What is the relationship between [H+] and [OH-] in water?

Back

In pure water at 25°C, the product of [H+] and [OH-] is constant: [H+][OH-] = 1.0 x 10^-14.

Front

How do you calculate [OH-] from [H+] concentration?

Back

To calculate [OH-], use the formula: [OH-] = 1.0 x 10^-14 / [H+].

Front

What is pOH and how is it related to pH?

Back

pOH is the negative logarithm of the hydroxide ion concentration: pOH = -log[OH-]. pH + pOH = 14 at 25°C.

Front

How do you calculate pOH from [OH-]?

Back

To calculate pOH from [OH-], use the formula: pOH = -log[OH-].

Front

What is the significance of a high Keq value?

Back

A high Keq value indicates that at equilibrium, the concentration of products is much greater than that of reactants, favoring the formation of products.