Equilibrium

​Reversible reactions

Are the ones in which the products, as soon as they are formed, react to produce the original reactants.

At equilibrium the two opposing reactions go on at equal rates, or velocities and hence there is no net change in the amounts of substances involved.

​

For a given reaction, at some specified condition of temperature and pressure, the ratio of the amounts of products and reactants present at equilibrium, is a constant, designated the equilibrium constant of the reaction and represented by the symbol K.​

​Calculate Kc

• Balance the equation.

• Write in square brackets products/reactants​.

• Use the coefficients as exponents.

• Calculate.​