# How do I work out the amount of H+ ions in a sodium hydroxide and water solution?

I know the $pH$, pressure, temperature and concentration of the solution. Is there a method I can use to work out the amount of $\ce{H+}$ ions?

• i.e the dissociation of the solution – Katherine Feb 22 '14 at 14:06

The pH can be directly related to the concentration of $\ce{H3O+}$:
$$\text{pH}=-\log{[\ce{H3O+}]}$$ $$\Downarrow$$ $$[\ce{H3O+}]=10^{-\text{pH}}$$