Formulas - Chemical Balance

KC = equilibrium constant as a function of concentrations
P = concentration of products
P = stoichiometric coefficient of products
R = reagent concentrations
r = stoichiometric coefficient of reagents

Tip: The equilibrium constant is dimensionless, ie it has no unity.

Equilibrium constant with liquid and solid substance

The concentration of substance in liquid or solid physical state is not placed, as well as the water. Only gaseous and aqueous substances.


CaO and CaCO3 are in the solid state, so we should not put them in the equilibrium constant.

Equilibrium constant as a function of partial pressures

For the constant KP (as a function of partial pressures) neither does the solid and liquid state change.


* Constant acidity and basicity

To the KThe It is calculated in the same way as the other constants.


Tip: OKThe serves to tell how strong or weak an acid is. The lower the KThe weaker is acid.

Usually strong acid has no KThe, as it means balance. If an acid is strong it dissociates completely, so it is not in equilibrium.

The same goes for the basicity constant (KB). The lower the value of KB weaker is the base.

* Kw

The ionic product of water is given by:

* pH

The pH calculation is used to calculate the concentration of H + ions in a solution.

It is a function of p, just as pOH is a function, but it calculates the amount of OH- ions in a solution.

Tip: The pH range ranges from 0 to 14. If a solution is between 0 and 7 it is considered acidic. If it is 7, it will be considered neutral. If the range is between 7 and 14 is a basic solution.

You can calculate the pH using pOH and vice versa:
See the formula used: