Читать книгу Biochemistry For Dummies - John Moore T., Richard Langley H., John T. Moore - Страница 22

You can calculate pOH (related to the concentration of the hydroxide ion) in a similar manner to the pH calculation. That is, you can use the equation . You can calculate the hydroxide ion concentration from the hydrogen ion concentration and the K_w (equilibrium constant) relationship:

A useful shortcut to get from pH to pOH is the following relationship: for any aqueous solution .

For example, if a solution has a , its pH would be

The calculation for the pOH of that solution is pretty simple:

Now, if you have the pH or pOH, getting the corresponding or is a simple task:

For example, a solution with a pH of 7.35 has a .