pH and 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[H₃O⁺].

Front

What is pOH?

Back

pOH is a measure of the hydroxide ion concentration in a solution, defined as pOH = -log[OH^-].

Front

What is the relationship between pH and pOH at 25°C?

Back

At 25°C, pH + pOH = 14.

Front

How do you calculate [H₃O⁺] from pH?

Back

[H₃O⁺] = 10^-pH.

Front

How do you calculate pH from [H₃O⁺] concentration?

Back

pH = -log[H₃O⁺].

Front

How do you calculate [OH^-] from pOH?

Back

[OH^-] = 10^-pOH.

Front

How do you calculate pOH from [OH^-] concentration?

Back

pOH = -log[OH^-].

Front

What is the [H₃O⁺] concentration if pH = 8?

Back

[H₃O⁺] = 1.0 x 10^-8 M.

Front

What is the pH of a solution with [OH^-] = 8.41 x 10^-4?

Back

pH = 10.92.

Front

If [H₃O⁺] = 1.7 x 10^-2 M, what is the pOH?

Back

pOH = 12.23.