Fundamentals of Chemistry
ACIDS, BASES, SALTS, AND pH
The hydrogen concentration, [H ], of a solution is 4.8 x 10 moles/liter. What
is the pH of the solution?
The pH of a solution is 3.83. What is the hydrogen concentration of the
It is also important to understand the relationship between the [H ] and the [OH ]
concentrations. The pOH of a solution is defined as the negative logarithm of the hydroxyl
concentration, represented as [OH ] in moles/liter.
pOH = -log [OH ]
[OH ] = 10
For water solutions, the product of the hydrogen ion concentration and the hydroxyl
concentration is always 1 x 10 at 25?C. This means that the sum of pH and pOH is equal to
14 under these conditions.
[H ] x [OH ]
= 1 x 10
pH + pOH
The following example illustrates this point.