pH/pOH Calculations

Front

What is pH?

Back

pH is a measure of the acidity or basicity of a solution, defined as the negative logarithm of the hydrogen ion concentration: pH = -log[H+].

Front

What is pOH?

Back

pOH is a measure of the basicity of a solution, defined as the negative logarithm of the hydroxide ion concentration: pOH = -log[OH-].

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C.

Front

How do you calculate [H+] from pH?

Back

[H+] = 10^(-pH).

Front

How do you calculate [OH-] from pOH?

Back

[OH-] = 10^(-pOH).

Front

What is the [H+] if the pH is 7?

Back

[H+] = 1.0 x 10^-7 M.

Front

What is the [OH-] if the pOH is 7?

Back

[OH-] = 1.0 x 10^-7 M.

Front

If the pH is 4.0, what is the [H+]?

Back

[H+] = 1.0 x 10^-4 M.

Front

If the pH is 4.0, what is the pOH?

Back

pOH = 10.0.

Front

What does a pH less than 7 indicate?

Back

A pH less than 7 indicates an acidic solution.