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The law of mass action

The law of mass action - do my homework (MWG) can be established for this equilibrium reaction.

K=c(H+)⋅c(OH-)c(H2O) or K=c(H3O+)⋅c(OH-)c(H2O)⋅c(H2O).

According to the MWG - urgent essay writing service , this equilibrium yields the temperature-dependent equilibrium constant K. Since the dissociation is so small, i.e. the equilibrium in autoprotolysis is far on the side of water, the concentration of water can be regarded as constant. It can thus be included in the equilibrium constant. The constant KW is called the ion product of water.


At 22°C, the ion product of water is 10^-14 mol^2/ l^2.


with the definition of the pH value and the pOH value can also be written for this:


Since in pure water, according to the reaction equation for autoprotolysis - chemistry solver , the concentration of H3O^+ ions is equal to the concentration of OH^- ions, the pH value of pure water is as follows

pH = 7

This value is also considered neutral. Higher concentrations of H3O^+ ions result in correspondingly lower pH values, while lower H3O^+ concentrations result in higher pH values.

Some examples of different pH values from everyday life:

- Stomach juice / lemon juice: 0.9 - 2.3

- Cola: 2.4

- wine: 3

- Acidic milk: 4.4

- Sweat: 4 - 6.8

- urine: 5 - 7

- Saliva: 6 - 8

- Milk: 6.4 - 6.7

- blood: 7.4

- Soap solution: 8 - 10

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